Solution -
CP of 18 oranges = 1
CP of 1 orange = 1/18
SP of 12 oranges = 1
SP of 1 orange = 1/12
SP of 18 oranges = (1/12) × 18
= 3/2
Profit = SP of 18 oranges - CP of 18 oranges
= 3/2 - 1
= 1/2
Profit percentage = 1/2 × 100
= 50%
Hence,
The correct answer is option (b) 50%.
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