A dealer purchased 180 bulbs for 15 each. He sold the bulbs for 20 each. Find the gain per cent.with formula
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Cost price = 180 x 15 = 2,700
Selling price = 180 x 20 = 3,600
Gain = selling price - cost price = 3,600 - 2,700 = 900
Gain percentage = gain / cost price x 100
= 900/2,700 x 100 = 33%
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