[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-207754-en":3,"doc-seo-207754-105":30,"detail-sidebar-cat-0-en-105":90},{"code":4,"msg":5,"data":6},0,"success",{"doc_id":7,"user_id":8,"nickname":9,"user_avatar":10,"doc_module":4,"category_id":11,"category_name":12,"doc_title":13,"doc_description":14,"doc_content":15,"file_id":16,"file_url":17,"file_type":18,"file_size":19,"view_count":4,"is_deleted":4,"is_public":20,"is_downloadable":20,"audit_status":20,"page_count":21,"language":22,"language_code":23,"site_id":24,"html_lang":23,"table_of_contents":25,"faqs":26,"seo_title":27,"seo_description":14,"update_tm":28,"read_time":29},207754,1099523882367,"Jordan Avery","https://ap-avatar.wpscdn.com/davatar_9964176cb1d06d4a9deccf72a44ae3dc",4,"Exam","Compound Interest - Exam Style Questions","A set of exam-style questions focused on compound interest and related exponential change scenarios. Problems cover bank deposits earning compound interest, interest paid yearly versus quoted values, repeated percentage depreciation of assets, and growth in a value that increases by a fixed percentage each year. Additional contexts include repeated bounce height reduction, stepwise percentage depreciation of a television, and applications to investments that exceed a threshold, radioactive decay, and weight loss targets.","| Name: |  |\n| --- | --- |\n| Exam Style Questions\u003Cbr>| |\n| Ensure you have: Pencil, pen, ruler, protractor, pair of compasses and eraser You may use tracing paper if needed |  |\n\nGuidance  \n1. Read each question carefully before you begin answering it.  \n2. Don ʼt spend too long on one question.  \n3. Attempt every question.  \n4. Check your answers seem right.  \n5. Always show your workings  \nRevision for this topic  \n© CORBETTMATHS 2014  \n1. Sebastian leaves £3000 in the bank for two years.  \n It earns compound interest of 2% per year.  \nCalculate the total amount Sebastian has in the bank at the end of the two years.  \n£.........................  \n(2)  \n2. Fiona leaves £1600 in the bank for four years.  \n It earns compound interest of 4% each year.  \nCalculate the total amount Fiona has in the bank at the end of the four years.  \n£.........................  \n(3)  \n3. A car was bought for £18000.  \n Its value depreciated by 15% each year for the first three years.  \nWhat was its value at the end of the three years?  \n£.........................  \n(3)  \n© CORBETTMATHS 2014  \n4. Sally bought a piano for £2200.  \nIn each year the value of the piano increases by 11% of its value at the start of that year.  \n(a) Find the value of the piano after one year.  \n£.........................  \n(2)  \n(b) Calculate after how many complete years the value of the piano will be at least £3200.  \n.........................years  \n(2)  \n5. Natalie invests £600 for 2 years at 10% per year compound interest.  \n How much interest does she earn?  \n£.........................  \n(2)  \n© CORBETTMATHS 2014  \n6. Jenny invests £400 for two years at 5% compound interest, paid yearly.  \n Tim says that the interest Jenny will receive will be £40.  \nIs Tim right?  \nExplain your answer.  \n(3)  \n7. When a tennis ball is dropped, it bounces and then rises.  \n The ball rises to 60% of the height from which it is dropped.  \nThe ball is dropped from a height of 2 metres.  \n(a) Calculate the height of the rise after the first bounce.  \n.........................m  \n(1)  \n(b) Calculate the height of the rise after the second bounce.  \n.........................m  \n(1)  \nThe ball carries on bouncing, each time rising to 60% of the last rise.  \n(c) For how many bounces does it rise to a height greater than 20cm? Show your working  \n(2)  \n© CORBETTMATHS 2014  \n8. The value of a television was £600 on 1st March 2013.  \nEvery four months, the value of the television decreased by 8% of its value atthe start of that four months.  \nWhat was the value of the television on 1st March 2014?  \n£.........................  \n(3)  \n9. £5200 is invested at 2.8% compound interest per annum.  \n How many years will it take for the investment to exceed £7000.  \n.........................years  \n(3)  \n© CORBETTMATHS 2014  \n10. A radioactive substance decays over time.  \n Every year its mass decreases by 14% .  \nHow many years will it take for 500kg of the substance to decay to a mass less than 200kg?  \n.........................years  \n(3)  \n11. Martyn has some money to invest and sees this advert.  \nWill Martyn double his money in 15 years by investing his money with “Bank of Maths?”  \nYou must show your workings.  \n(4)  \n© CORBETTMATHS 2014  \n12. James weighed 100kg.  \nHis target was to weigh 80kg or less. His weight decreased by 3% each month.  \nHas he achieved his target after six months?  \nShow your workings.  \n(3)  \n13. A fish tank has sprung a leak, at the base of the tank.  \n 5% of the water is lost every minute.  \nHow much water is lost from the tank after ten minutes?  \n(3)  \n© CORBETTMATHS 2014","cbCaioptgv7SugY3","https://ap.wps.com/l/cbCaioptgv7SugY3","pdf",146653,1,7,"English","en",105,"# Guidance\n## Revision for this topic\n# Questions\n## Compound interest and depreciation\n## Growth, decay, and repeated percentage loss","[{\"question\":\"What guidance is given before starting the questions?\",\"answer\":\"Read each question carefully, don’t spend too long on any one question, attempt every question, check answers, and always show workings.\"},{\"question\":\"How are compound interest questions structured?\",\"answer\":\"They typically provide an initial amount, a time period, a yearly interest/depreciation rate, and ask for the final amount or when a threshold is exceeded.\"},{\"question\":\"Do the questions include contexts beyond simple bank interest?\",\"answer\":\"Yes. They also use repeated percentage change for car value depreciation, piano value growth, bounce height reduction, television depreciation every four months, radioactive decay, and monthly weight loss.\"}]","Compound Interest - Exam Style Questions | PDF",1788601059,18,{"code":4,"msg":31,"data":32},"ok",{"site_id":24,"language":23,"slug":33,"title":13,"keywords":34,"description":14,"schema_data":35,"social_meta":85,"head_meta":87,"extra_data":89,"updated_unix":28},"compound-interest-exam-style-questions","",{"@graph":36,"@context":84},[37,53,67],{"@type":38,"itemListElement":39},"BreadcrumbList",[40,44,48,51],{"item":41,"name":42,"@type":43,"position":20},"https://docshare.wps.com","Home","ListItem",{"item":45,"name":46,"@type":43,"position":47},"https://docshare.wps.com/document/","Document",2,{"item":49,"name":12,"@type":43,"position":50},"https://docshare.wps.com/document/exam/",3,{"item":52,"name":13,"@type":43,"position":11},"https://docshare.wps.com/document/compound-interest-exam-style-questions/207754/",{"url":52,"name":13,"@type":54,"author":55,"headline":13,"publisher":57,"fileFormat":60,"inLanguage":23,"description":14,"dateModified":61,"datePublished":61,"encodingFormat":60,"isAccessibleForFree":62,"interactionStatistic":63},"DigitalDocument",{"name":9,"@type":56},"Person",{"url":41,"name":58,"@type":59},"DocShare","Organization","application/pdf","2026-09-05",true,{"@type":64,"interactionType":65,"userInteractionCount":4},"InteractionCounter",{"@type":66},"ViewAction",{"@type":68,"mainEntity":69},"FAQPage",[70,76,80],{"name":71,"@type":72,"acceptedAnswer":73},"What guidance is given before starting the questions?","Question",{"text":74,"@type":75},"Read each question carefully, don’t spend too long on any one question, attempt every question, check answers, and always show workings.","Answer",{"name":77,"@type":72,"acceptedAnswer":78},"How are compound interest questions structured?",{"text":79,"@type":75},"They typically provide an initial amount, a time period, a yearly interest/depreciation rate, and ask for the final amount or when a threshold is exceeded.",{"name":81,"@type":72,"acceptedAnswer":82},"Do the questions include contexts beyond simple bank interest?",{"text":83,"@type":75},"Yes. 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