首先來(lái)分析一下這道題:You are examining whether your savings will be adequate to meeting your retirement needs.(你在檢查你的儲(chǔ)蓄夠不夠退休用,對(duì)解題沒(méi)又幫助,只是背景.)You saved $1500 last year,and you expect your annual savings to grow 5% a year for the next 15 years.(你去年存了1500美元,并且你希望之后的每年的儲(chǔ)蓄比上一年多出5%,即如果你去年儲(chǔ)存了100美元,今年還得在往銀行里面儲(chǔ)存105美元,而這一句是用expect來(lái)說(shuō)的,就是說(shuō)只是希望.)If you can invest your money at 8%,how much would you expect to have at the end of the fifteenth year?(假如你現(xiàn)在有能力每年儲(chǔ)存的比前一年多8%,十五年后預(yù)期的存款是多少?)
正確的答案應(yīng)該是:1500+1500*(1+8%)+1500*(1+8%)^2+...+1500*(1+8%)^15=45486.425781
上面的結(jié)果我是靠C語(yǔ)言編程算出來(lái)的值.以上別人的答題我差不多都看了,除了我在答題過(guò)程中提交的,沒(méi)有一個(gè)上3000的,請(qǐng)問(wèn)一個(gè)人退休后就靠不到3000元能活多久呢?!