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**Correct Option: A**

**Solution:**

Let the cost price of 1 mango be 10, therefore, cost price of 20 mangoes will be Rs. 200

SP of 15 mangoes is equal to CP of 20 mangoes = Rs. 200

CP of 15 mangoes = Rs. 150

Profit = 200-150/150*100=50/150*100=33.33%