3. A shopkeeper buys 100 pens for 10 each and sells 20 of them at a gain of 10%. What percent he
sells the remaining so as to gain 20% in all.
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Step-by-step explanation:
he buys pens each pen price ₹10
sold20 pendants gain10%profit
he has to sell again 40 pens to get again 20%
means 10+20=30%
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