If 5% more is gained by selling an article for Tk. 350 than by selling it for TK. 340, the cost of the article is:

A Tk. 50

B Tk. 160

C Tk. 200

D Tk. 225

Correct Answer: Option C

suppose, the cost=x tk so,first gain=(340-x)tk second gain=(350-x)tk so,difference=(350-x)-(340-x)tk=10 tk here, 5%=10tk so,100%=200 tk