It would be: A 2 radical 5
6.5%=.065
.065/12=0.00541666666666666666666666666667/month
3 years = 36 months
(1+0.00541666666666666666666666666667)^36=1.2146716269797335689295444127607
1.2146716269797335689295444127607 x 12500=$15183.40 in the account after 3 years
15183.40-12500=$2683.40 in interest earned
☺☺☺☺
I'm pretty sure that this is a trick question, the answer is 61%.
Let, his original money = x
It would be: x * 1/2 = 120
x = 120 * 2
x = 240
In short, Your Answer would be $240
Hope this helps!