Question

The banker's discount on Rs. 1800 at 12% per annum is equal to the true discount on Rs. 1872 for the same time at the same rate. Find the time.

Answer 1

S.I. on Rs. 1800 = T.D. on Rs. 1872. 

P.W. of Rs. 1872 is Rs. 1800. 

Rs. 72 is S.I. on Rs. 1800 at 12%. 

Time =[(100 x 72)/ (12 x 1800)]year 1/3 year = 4 months.