The true discount on Rs.1600 due to after a certain of 5% per annum is Rs.160. The time after which it is due is  Choose the correct choice from the following:
A) 27months
B) 23months
C) 20months
D) 12months
E) None of these
Explanation:   P.W. = Rs. (1600 - 160) = Rs. 1440   ∴ S.I. on Rs.1440 at 5% is Rs. 160.   ∴ Time = [100 × 160/1440 × 5] = 20/9 years = [20/9 × 12] months = 27 months.   27monthsnswer: 27months
<result>A</result>
The true discount on Rs.1600 due to after a certain of 5% per annum is Rs.160. The time after which it is due is