a profit on the sale的用法和样例：
- They made a handsome profit on the sale of the flat.
- He made a profit of $50,000 on the sale of his house.
- I sold my house at a profit; I made a profit of $ 2,000 on the sale.
- He made a great profit on the transaction.
- On the basis of our sales forecasts, we may begin to make a profit next year.