The sale price of an article including the sales tax is Tk. 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 Tk. 500

B Tk. 515

C Tk. 550

D Tk. 600

Correct Answer: Option A

cost price=500 then,in 12% profit, selling price=500 x 112/100=560 tk with 10% tax, price= 560+56=616 tk