SOLUTION: Judy invests a certain amount of money at 7% annual interest and three times that amount at 8%. If her annual income is $232.50, how much does she have invested at each rate?
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Question 58106: Judy invests a certain amount of money at 7% annual interest and three times that amount at 8%. If her annual income is $232.50, how much does she have invested at each rate?
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You can put this solution on YOUR website! .07X+.08*3X=232.50
.07X+.24X=232.50
.31X=232.50
X=232.50/.31
X=750
3X=2250
PROOF
.07*750+.08*2250=232.50
52.50+180=232.50
232.50=232.50
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