Roberto purchased airline tickets for his family. The tickets cost 1 dollars comma 250 The airline also charged a luggage fee, bringing the total cost to 1 dollars comma 400 What is the percent increase in the cost due to the luggage fee?

The luggage fee increased the total from $1,250 to $1,400, so the increase was $1,400 − $1,250 = $150. To find the percent increase, divide the increase by the original cost: $150 ÷ $1,250 = 0.12, or 12%. Therefore, the cost increase is 12 percent.

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