You have 200 items that cost $20 and you are selling them at the price of $100.

When only 150 items are left, you sell them all off at 20% discount.

What is your total profit?

To confirm the person who answered earlier, $13,000 is your profit.

Your total profit is $13,000. First you bought the 200 items for $20 each. That costs $4,000. Then you sold $50 of the items at $100 each. That's $5,000. So already you're in the green. You've already made $1,000 profit. Then you sold the rest of the items at a 20% discount. 150 items multiplied by $80 is $12,000. $12,000 plus the $1,000 equals $13,000 total.