A man buys a watch for Rs. 1950 in cash and sells it for Rs. 2200 on credit for 1 year. If the rate of interest is 10% per annum, what is his gain or loss?

Irza Afzad Arithmetic/ Basic Math, css, Full List, Mathematics

A. gains Rs. 55
B. gains Rs. 50
C. loses Rs. 30
D. gains Rs. 30