Question

A total of $22,000 is invested in two municipal bonds that pay 4.25% and 5.75% simple interest. The investor wants an annual interest income of $1085 from the investments. What amount should be invested in the 4.25% bond?

Answer 1

If $x is at 4.25%, the rest (22000-x) is at 5.75%

So, just add up the interest received:

.0425x + .0575(22000-x) = 1085