A man buys a watch for Rs. 1950 in cash and sells it for Rs. 2200 on credit of 1 year. If the rate of interest is 10% per annum, the man: Choose one.
A) gains Rs. 55
B) gains Rs. 50
C) loses Rs. 30
D) gains Rs. 30
E) None of these
Explanation:   S.P. = P.W. of Rs. 2200 due in 1 year. Thus,   =Rs.[2200×100/100+(10×1)]   = Rs. 2000.   Gain = Rs.(2000 - 1950) = Rs.50.   Answer: gains Rs. 50
<result>B</result>
A man buys a watch for Rs. 1950 in cash and sells it for Rs. 2200 on credit of 1 year. If the rate of interest is 10% per annum, the man: