Final answer:
To calculate the total cost of the Jones family's meal including an 18% tip, convert the tip to a decimal, multiply by the meal cost, round to the nearest cent, and add to the original bill. The total cost is not among the provided options; it should be $78.71.
Step-by-step explanation:
The Jones family went out to dinner and spent $66.70, wanting to tip the waiter 18%. To find out the total cost of their meal including the tip, we need to calculate the tip amount and add it to the original bill.
Step-by-Step Solution
- First, convert the tip percentage to a decimal by dividing by 100: 18% ÷ 100 = 0.18.
- Next, multiply the decimal tip rate by the cost of the meal to find the amount of the tip: 0.18 × $66.70 = $12.006.
- Round the tip amount to the nearest cent, which gives us $12.01.
- Finally, add the tip to the original cost of the meal to find the total cost: $66.70 + $12.01 = $78.71.
Therefore, the correct answer is $78.71, which is not presented in the options given in the question. The student should clarify the available options or provide the correct figures for an accurate answer.