Pre-Algebra can you please help?!

Lester deposited $400 into a savings
account earning 4.5% simple interest, and
$450 into an investment account earning
3.2% interest compounded annually. What
was the total interest he earned in 3 years?

A $986.00
B $89.06
C $9.60
D $98.60

asked by DerpyPegasus33
  1. what is

    totalINTEREST= 400( 1.045)^3 + 450( 1.032)^3 -400-450

    put this in your google search window
    400( 1.045)^3 + 450( 1.032)^3 - 850=

    posted by bobpursley
  2. It gives me 101.06. That's not in the answer options...

    posted by DerpyPegasus33
  3. Opps, it is wrong. This said simple interest, not compounded.
    try
    totalINTEREST= 400( .045)x3 + 450(.032)x3

    posted by bobpursley
  4. interest from simple interest = 400(.045)(3) = 54
    interest fromt he compound account
    = 450(1.032)^3 - 450 = 44.60

    total interest = 54 + 44.60 = 98.60 , which is D

    posted by Reiny
  5. Yeah it gave me D. I did both the simple and compound interest and then added them to get my answer. Thanks!!!

    posted by DerpyPegasus33

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