By selling 18 oranges for a rupee a man losses 20%. How many oranges should he sell for a rupee to earn 20% profit.

8 10 12 16

12

CP = \(\frac{1}{18}\) × \(\frac{100}{80}\) = \(\frac{5}{72}\) SP = \(\frac{5}{72}\) × \(\frac{120}{100}\) = \(\frac{1}{12}\) He should sell 12 oranges for Rs.1