Question 1144256
Investments: Aaron invested equal amounts of money at 5%, 7%, 9%, and 11% annual interest.
 If the four investments yielded a total of $1440 annual interest, find the total amount invested. 
Let a = total amt invested
.05a +.07a + .09a + .11a = 1440
.32a = 1440
a = 1440/.32
a = $4500 invested
then
.05(4500) = 225 invested at 5%
.07{4500) = 315  "  " 7%
.09(4500) = 405  "  " 9%
.11(4500) = 495  "  " 11%
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total inv: 1400