SOLUTION: Setsu Yamamoto invested $36000, part at 5% interest and the remainder at 8% interest. If she earned twice as much from her 5% investment as here 8% investment, how much did she inv

Question 1144526: Setsu Yamamoto invested $36000, part at 5% interest and the remainder at 8% interest. If she earned twice as much from her 5% investment as here 8% investment, how much did she invest at each rate?

Answer by greenestamps(13198) (Show Source): You can put this solution on YOUR website!

The given numbers are probably bad, since the answers are not whole numbers of dollars, or even whole numbers of cents.

Here is a non-algebraic attempt to solve the problem; perhaps another tutor will show an algebraic solution method which also shows the numbers to be bad.

The ratio of the percentages is 5:8.

Since the return from the 5% investment is 2 times the return from the 8% investment, the ratio in which the money is divided between the two investments is 5:16.

So 16/21 of the $36,000 was invested at 5% and 5/21 of it at 8%.

But those are not good answers....
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