Rs. 4800 becomes Rs. 7200 at a certain rate of interest compounded annually in 5 years. Find the amount at the end of 15 years.
Answer & explanation
Correct answer: option 3
Principal : Amount
5yrs: 4800 : 7200
5yrs: 2 : 3
10yrs: 22 : 32
15yrs: 23 : 33
8 : 27
⇓× 600 ⇓
4800 ⇓× 600
16200/-