By selling 45 oranges for Rs. 40, a man loss 20%. how many

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By selling 45 oranges for Rs. 40, a man loss 20%. how many should he sell for Rs. 24 so as to gain 20% in the transaction ?

1. 16
2. 18
3. 20
4. 22

Correct Option: B

Cost price for 45 oranges - 20% = Rs. 40.
∴ Cost price for 45 oranges = Rs. 50.

When he sells for Rs. 24 his gain is 20%, hence cost price is Rs 20.
Number of oranges = (20 x 45)/50 = 18