A certain sum amounts to Rs. 4205.55 at 15% p.a. in 2\(\frac{2}{5}\) years, interest compounded yearly. Find triple of sum.

13000 9000 14000 15000

9000

Total amount = 11214.8 amount given = 4205.55 11214.8 R = 4205.55 R = 0.375 8000  R = 3000 triple of sum = 9000