its in the description

Question

Suppose Brian travels 30.8 kilometers from Mexico to the U.S. to shop. Each item that he buys in the U.S. is approximately $0.50 cheaper than what he would have paid in Mexico. The cost of fuel is $0.15 for each mile traveled. How many items does Brian need to buy to make the trip worthwhile? Remember to take the cost of fuel for a round trip into account. Hint

Answer 1

Brian travel 61.6 km (2 times 30.8)

This costs $9.24 (61.6 times $0.15)

He must buy 18.28 items ($9.24 divided by $0.50)

 

Of course he cannot buy 0.28 of an item, so he must buy 19.