. A professor has RM 15000 to invest for one year, some are 8% and the rest are at 7% annual interest. If she will earn RM 1100 from these investments, how much did she invest at each rate?

3 answers

At 8%, she gets RM1200.
At 7%, she gets RM1050.

Let x be the fraction he invested at 8%, the 1-x is what he invested at 7%.
we have
x*1200+(1-x)1050=1100
Solve for x.

10

hint: x=1/3

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