SOLUTION: Marcia has $18,000 to invest in two different investment. she invested $10,000 at 4% yearly interest in one investment. at what rate must she in vest the remainder so that she ea

Question 1112018: Marcia has $18,000 to invest in two different investment. she invested $10,000 at 4% yearly interest in one investment. at what rate must she in vest the remainder so that she earns a yearly interest of more then $700?

Answer by ikleyn(52776) (Show Source): You can put this solution on YOUR website!
.

The interest generated by the 1-st investment is 0.04*10000 = 400 dollars.


She wants  to get at least  700 - 400 = 300 dollars more.


Hence, the second investment of 18000-10000 = 8000 dollars should generate at least 300 dollars interest:


x*8000 >= 300  ====>  x >=  = 0.0375.


Answer.  She must invest the second investment at least  3.75%.

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