The banker's discount on Rs 3200 at 6% is the same as the true discount on Rs 3248 for the same time and at the same rate. What is time?

SI on Rs.3200 = TD on Rs. 3248 Therefore 3200 is P.W. of Rs. 3248 => Rs.48 is the SI on Rs. 3200 at 6% Therefore Time = 100*48 / 3200*6 year = .25 = 1/4 year = 3 months