To earn extra money in the summer, you grow tomatoes and sell them at a local farmers'

Question:

To earn extra money in the summer, you grow tomatoes and sell them at a local farmers' market for 30 cents per pound. By adding compost to your garden, you can increase your yield as shown in the table on the next page. If compost costs 50 cents per pound and your goal is to make as much profit as possible, how many pounds of compost should you add?