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Mona invests $1000 at 7% yearly interest. How much does she have to invest at 4% so that the total yearly interest from the two investments exceeds $138?

Answer :

sqdancefan

Answer:

  more than $1700

Step-by-step explanation:

If P represents the amount invested at 4%, Mona's annual interest is ...

  $1000×0.07 + P×0.04 > $138

  P×0.04 > $68 . . . . . . subtract $70

  P > $1700 . . . . . . . . . divide by the coefficient of P

Mona must invest more than $1700 at 4% to achieve total yearly interest of more than $138.

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