The sale price of an article including the sales tax is Rs. 616. The rate of sales tax is 10%. If the shopkeeper has made a profit of 12%, then the cost price of the article is:

A. Rs. 500
B. Rs. 515
C. Rs. 550
D. Rs. 600

Explanation:

110% of S.P. = 616

S.P. = (616 * 100)/110 = Rs. 560
C.P = (110 * 560)/112 = Rs. 500