If Rupees 64 amount to Rupees 83.20 in 2 years, what will rupees 86 amount to in 4 years at the same rate per cent per annum?

If Rupees 64 amount to Rupees 83.20

 in 2 years, what will rupees 86 

amount to in 4 years at the same 

rate per cent per annum?

(a) Rupees 137.60
(b) Rupees 124.70
(c) Rupees 114.80
(d) Rupees 127.40

Correct answer: a
Solution :