英语翻译Jayesh invests $250 in a building society on the first day of each month for one complete year.The account pays interest at 3/4% for each complete month.How much does Jayesh have invested at the end of the year(but before making a thirtee

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英语翻译Jayesh invests $250 in a building society on the first day of each month for one complete year.The account pays interest at 3/4% for each complete month.How much does Jayesh have invested at the end of the year(but before making a thirtee
英语翻译
Jayesh invests $250 in a building society on the first day of each month for one complete year.The account pays interest at 3/4% for each complete month.How much does Jayesh have invested at the end of the year(but before making a thirteenth payment)?
4楼和5楼的公式是怎么得出来的呢?用这个公式算的话,第一个月的钱不对丫?

英语翻译Jayesh invests $250 in a building society on the first day of each month for one complete year.The account pays interest at 3/4% for each complete month.How much does Jayesh have invested at the end of the year(but before making a thirtee
Jayesh在一年中,每个月第一天都往建房基金投入250美金.每月回报利率为0.75% 到年底Jayesh 总共在账户上有多少钱（第十三次付款前）?
compound interest
钱= 250*1.0075*（1.0075^12 - 1）/（1.0075 - 1）
=3150.348313
要几位有效数字你自己看吧
geometric progression你总该学过吧.
就是 a ,ar ,ar^2 ,ar^3 ,ar^4……这n个数的和=a(r^n - 1)/(r - 1)
第一个月底=250*1.0075
第二个月底=（250*1.0075+250）*1.0075=250*1.0075^2+ 250*1.0075
……
第n月底=250*1.0075^n + 250*1.0075^(n-1) + ……+250*1.0075
你学过那个公式吧,geometric progression中文是什么我不知道.不过你应该知道,要不,你做这题干嘛

Jayesh在一年中，每个月第一天都往建房基金投入250美金。每月回报利率为0.75% 到年底Jayesh 总共在账户上有多少钱（第十三次付款前）？
第一个月投入250 月底有 250+250*0.0075=251.875
第二个月投入250 月底有（250+251.875）+ （250+251.875）*0.0075=505.64
第三个月投入250 月底有（...

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选二楼

这是一道compound interest（复合利率）的精算题，翻译请根据simonsun347 的回答，解答我来回答。。
根据公式：
S=R(((1+i)^n-1)/i)(1+i)
=250(((1+0.0075)^12-1)/(0.0075))*(1.0075)
=3150.348
二楼的解答计算错误，而且没有用公式，计算起来会非常麻烦，本人现在...

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Jayesh在整整一年的时间内，每个月第一天都往建房互助协会投入250美金。，每月的利率为0.75%.到年底Jayesh 总共在账户上有多少钱（第十三次给付利息前）？
key

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