Jonathan pays $1.90 per pound for potatoes. He buys 8.3 pounds of potatoes. He determines that he will pay $15.77, before tax, for the potatoes. Which best describes the reasonableness of Jonathan's solution?

The equation for this problem would be 15.77=1.90 times 8.3, as Jonathan buys 8.3 pounds of potatoes and one pound is $1.90. To get the entire cost without the tax, you have to include how much the entire quantity of the product costs, not just part of it.