By selling a pen for Tk. 15, a man loses one-sixteenth of what it costs him. The cost price of the pen is:

A Tk.16

B Tk. 18

C Tk. 20

D Tk. 21

Correct Answer: Option A

let, the cost price of the pen is x taka

x - 15 = x/16
⇒ 16x - 16 × 15 = x
⇒ 16x - x = 16 × 15
⇒ 15x = 16 × 15
∴ x = 16 taka