The holder of a bill for Rs. 17850 nominally due on 21st May, 1991 received Rs. 357 less than the amount of the bill by having it discounted at 5%. When was it discounted?

Clearly S.I. on Rs. 17850 at 5% is Rs. 357.
∴ Time = (100 x 357) / (17850 x 5) = 2/5 = 146 days
So, the bill is 146 days prior to 24th May, the legally due date
May, April, March, Feb., Jan.,Dec.,
= 24 + 30 + 31 + 28 + 31 + 2 = 146 days
So, the bill was discounted on 29 Dec. 1990.