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makiahlynn706
09.09.2019 •
Mathematics
Sally makes deposits into a retirement account every year from the age of 30 until she retires at age 65. a) if sally deposits $ 1000 per year and the account earns interest at a rate of 7 % per year, compounded annually, how much does she have in the account when she retires? b) how much of that total amount is from sally's deposits? how much is interest?
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Ответ:
Use the annuity formula:
Total = P((1+i)^n-1 / i)
In the problem P = 1000 per year, i = 0.07 ( 7%), n = 65-30 = 35
W = 1000(1+0.07)^35 -1 / 0.07)
W = $138,237
Total amount in the account is $138,237
The amount she deposits is 1000 per year x 35 years = $35,000
Total interest is 138,237 - 35,000 = $103,237
Ответ:
we suggest this equation:
40-x=5(12-x)
40-x=60-5x
-x+5x=60-40
4x=20
x=20/4=5
answer. 5 years.