SOLUTION: A certain sum of money is invested at 10%. Twice that amount is invested at 8%. The total amount of interest from both investments is 91 dollars. How much is invested at 8%.
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Question 200181: A certain sum of money is invested at 10%. Twice that amount is invested at 8%. The total amount of interest from both investments is 91 dollars. How much is invested at 8%.
Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
.10x+.08*2x=91
.10x+.16x=91
.26x=91
x=91/.26
x=$350 is the amount invested @ 10%
2*350=$700 is the amount invested @ 8%
Proof:
.10*350+.08*700=91
35+56=91
91=91
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