A man buys a watch for Rs. 1950 in cash and sells it for Rs. 2200 at a credit of 1 year. If the rate of interest is 10% per annum, the man:

(A) gains Rs. 55 (X)
(B) gains Rs. 50 ()
(C) loses Rs. 30 (X)
(D) gains Rs. 30 (X)

Answers: A man buys a watch for Rs. 1950 in cash and sells it for Rs. 2200 at a credit of 1 year. If the rate of interest is 10% per annum, the man gains Rs. 50.