suppose you have $12000 to invest. if part is invested 10% and the rest at 15%, how much should be invested at each rate to yield 12% on the total investment?

Answer 1

amount invested at 10% --> x
amount invested at 15% --> 12000 - x

solve

.1x + .15(12000-x) = .12(12000)

I suggest multiplying by 100 to get rid of decimals, but not necessary

Answer 2

the above answer is right

Answer 3

7,200 at 10% and 4,800 at 15%.