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?
Choose the correct choice from the following:
A) 3 months
B) 4 months
C) 5 months
D) 6 months
E) 7 months
Solution   S.I on Rs.1800 = T.D on Rs.1872.   P.W on Rs.1872 is Rs.1800.   Rs.72 is S.I on Rs. 1800 at 12%.   Time	=(100x72 / 12x1800)   = 1/3 year   = 4 months.   Answer 4 months
<result>B</result>
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?