The cost of a shirt after a 15 percent discount is Rs. 102. What is the cost of the Shirt before the discount?

A) 117

B) 120

C) 116

D) 121

Selling price = 102

Discount = 15%

And we’ve to find Marked Price (cost of shirt before as mentioned in question)

SP = MP – D%

102 = 85% of MP

So, MP = Rs.120