Subject: mathqa
Question: adam borrowed some money at the rate of 6 % p . a . for the first two years , at the rate of 9 % p . a . for the next 3 years , and at the rate of 14 % p . a . for the period beyond 4 years . if he pays a total interest of 11900 at the end of 9 years , how much money did he borrow ?
Option: 
A: 14,000
B: 16,536
C: 12,526
D: 16,000
Answer: C