A person subscribing to sky cable for a year pack Rs. 1785. If the monthly subscription is Rs. 175, how much discount does a yearly subscriber get?

Answer: Option C

Yearly subscription rate = Rs. 1785
Charge for 12 month as rate Rs. 175 per month
= 12 × 175 = Rs. 2100
Discount = 2100 - 1785 = Rs. 315
% discount = $$\frac{315\times 100}{2100}$$   = 15%