Posted by Jaison on .
You would like to invest in $12,000 in two different bonds. Some of the amount will be invested in treasury bonds at 10% annual interest and the rest in municipal bonds at 15%. What amount should be invested in each type of bond rate if the annual yield expected is $1,440?

Math 
Helper,
x = amt invested at 0.10
y = amt invested at 0.15
0.10x + 0.15y = 1440
x + y = 12000
Solve for x and y simultaneously
If you are correct,
x = $7,200
y = $4,800