Question

Carletta has 23000 dollars to invest. As her financial consultant, you recommend that she invest in Treasury Bills that yield 7%, Treasury Bonds that yield 8%, and corporate bonds that yield 9%. Carletta wants to have an annual income of 1800 dollars, and the amount invested in corporate bonds must be half that invested in Treasury Bills. Find the amount she should place in each investment.

Answer 1

If the 7,8,9% amounts are x,y,z, respectively, then we have

x+y+z = 23000
.07x + .08y + .08z = 1800
z = x/2

Just solve that for your answers.
Trés simples!