Final answer:
To calculate the tip amount, multiply the cost of the meal by the tip rate. In this case, the tip amount was $12.96.
Step-by-step explanation:
To find the total cost of the dinner, first, we need to find the amount of the tip. The cost of the meal was $72, and the restaurant added an 18% tip. To calculate the tip, convert 18% to a decimal by dividing it by 100: 18/100 = 0.18. Then, multiply the cost of the meal by the tip rate: $72 * 0.18 = $12.96. So, the tip amount was $12.96.