Sumit purchased 20 dozens of bats at the rate of Rs. 450 per dozen. He sold each one of them at the rate of Rs. 40. What was his percentage profit

Sure, let's break it down:

1. First, we need to find out the total cost of the bats. Sumit bought 20 dozens of bats at Rs. 450 per dozen. So, the total cost is 20 dozens * Rs. 450/dozen = Rs. 9000.

2. Next, we need to find out how much Sumit earned from selling the bats. He sold each bat at Rs. 40. Since he bought 20 dozens of bats, and there are 12 bats in a dozen, he had a total of 20 * 12 = 240 bats. So, the total amount he earned from selling the bats is 240 bats * Rs. 40/bat = Rs. 9600.

3. Now, we can calculate the profit. The profit is the amount earned from selling the bats minus the cost of the bats. So, the profit is Rs. 9600 - Rs. 9000 = Rs. 600.

4. Finally, we can calculate the percentage profit. The percentage profit is the profit divided by the cost, times 100%. So, the percentage profit is (Rs. 600 / Rs. 9000) * 100% = 6.67%.

So, Sumit's percentage profit was 6.67%.