1book was sold for 800 rs at 15percent loss. At what price book should be sold so that he would get 20 percent profit
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By selling 15 books, one gets a profit equal to the cost of 3 books
Let the cost of each book be ₹x.
Therefore, cost of 15 books is ₹15x
The cost of three books = ₹3x
One gets a profit equal to the cost of 3 books. Therefore
Profit/Gain = Cost of three books = ₹3x
We know Gain % = Gain/Cost price ×100
Thus Gain % = 3x/15x × 100
Gain% = 100/5
Gain% = 20%
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