Omar buys 250 paper clips for 40p each.He sells 710 of the clips for 47p each.He sells 10% of the clips for 42p each.He sells the rest of the clips for 37p each.Calculate his percentage profit.

Sure, let's break it down:

1. First, calculate the total cost of the paper clips Omar bought. He bought 250 paper clips at 40p each, so the total cost is 250 * 40p = 10,000p.

2. Next, calculate how much Omar earned from selling 710 paper clips at 47p each. This comes to 710 * 47p = 33,370p.

3. Then, calculate how many paper clips Omar sold at 42p each. This is 10% of the total number of paper clips, so it's 10/100 * 250 = 25 paper clips. The total amount he earned from this is 25 * 42p = 1,050p.

4. Now, calculate how many paper clips Omar has left. He started with 250, sold 710 and then another 25, so he has 250 - 710 - 25 = -485 paper clips left. This is not possible, so there seems to be a mistake in the question. Omar cannot sell more paper clips than he bought.

Please check the question again.