Mohan bought 25 books for $ 2,000 and sold them at a profit

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Mohan bought 25 books for $ 2,000 and sold them at a profit equal to the selling price of 5 books. The selling price of 1 book is

Let the SP of 1 book = y
∴ SP of 25 books = 25y
According to the question,
25y – 2000 = 5y
⇒ 25y - 5y = 2000
⇒ 20y = 2000

⇒ y =	2000	= 100
	20

∴ SP of 1 book = $ 100