The cost price of a book is 300. The shopkeeper wants to gain 20% after allowing a discount of 10% on the marked price. Then the marked price of the book must be
Cost price of the book = 300
Shop keeper wants to gain 20% i.e s.p = 360
Selling price should be 360 after giving a discount of 10%,
 90% of MRP = 360
MRP = 400
Hence, option C is the correct answer.
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