Question 113986
We can solve this by setting up a sysrem:


Since we know the the total investment was 20,000, 100% of both rates is written as


x + y = 20,000


And since the given rates of the investment, 14% and 13%, yielded 2,720 we have


0.14x + 0.13y = 2,720


From the first equation, let 
x = -y + 20,000


So let's plug this into the second equation:


0.14(-y + 20,000) + 0.13y = 2,720
-0.14y + 2,800 + 0.13y = 2,720
-0.01y + 2,800 = 2,720
-0.01y = -80
y = 8,000


Now, we can subtract our y value from 20,000 in order to find x:


x = -y + 20,000
x = -8,000 + 20,000
x = 12,000