Question 974099
16,250 *0.20=3250
She has $13,000 left

cd=x
bond=13,000-x

.04x + .07(13,000-x)=780

.04x + 910 -.07x =780

-.03x = -130


x=$4333.33 ;;cd   


13000-x=$8666.67 ;;bond   

Check: 
4333.33*.04=173.32
8666.67*.07=606.67.   Sum is $780.