Question 976686
100% + 9.5% = 109.5% = 1.095
12000 x 1.095^n > 15000
1.095^n > 15000/12000
1.095^n > 1.25
n log1.095 > log1.25
n > log1,25/log1.095
n> 2.5
So 3 months is the answer.
Hope this helps:-)