Asked by Kevin

Carletta has $10,000 to invest. As her financial consultant you recommend that she invest in Treasury Bills that yield 6%, Treasury Bonds that yield 7%, and coroporate bonds that yield 8%. Carletta wants to have an annual income of $680, and the amount invested in corporate bonds must be half that invested in Treasury Bills. Find the amound she should place in each investment using matrix.
Answered by Reiny
why use a matrix for such a simple question?

let the amount invested at corporate bonds be $x
then the amount invested in treasurey bonds is $2x
then the amount invested in treasure bills is 10000-x-2x

then .06(10000-3x) + .07(2x) + .08x = 680

solve for x
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