Final answer:
The unit price per combo meal is calculated by dividing the total cost, $84, by the number of combo meals, which is 12, resulting in a unit price of $7. Hence, one combo meal would also cost $7.
Step-by-step explanation:
The question involves determining the unit price per combo meal based on the total spent by Luis. The first step is to find out the cost per item when given the total cost and quantity.
To calculate the unit price, we divide the total cost ($84) by the number of combo meals (12). So, the calculation would be:
Unit Price per Combo Meal = Total Cost / Number of Combo Meals
Unit Price per Combo Meal = $84 / 12 = $7
So, the unit price per combo meal is $7. Therefore, if Luis were to buy just one combo meal, it would also cost $7.