10. The printed price on a book is RS. 400, a bookseller offers a 10% discount on it. If he still earns a profit of 12%, then the cost price of the book is
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MP = Rs.400
SP = 400 x 90/100 = Rs.360
Cost Price = a
a x 112/100 = 360
a = 36000/112 = 321.43
Cost price of the book = Rs.321.43
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