The menu price of a sandwich at a restaurant is $6. The meal is subject to a 5% food tax, and Marcy would like to leave a gratuity of 20% on the pre-tax cost. Which plans will work to correctly determine exactly how much money, including tax and tip, Marcy will need?
Answer
A
Calculate the tax, and then find the tip on the new total.
B
Calculate the tip, and then find the tax on the new total.
C
Add the percents to get 25%, and then find 25% of $6 to add to the bill.
D
Calculate the tip and tax on the $6 total separately, and then add both to the bill.
Explanation
The tax is 5% of $6, or $0.30, and the tip is 20% of the pre-tax $6, or $1.20. Together, these add $1.50 to the $6 bill, making the total $7.50. Choice C works because 5% + 20% = 25%, and 25% of $6 is $1.50; choice D works by calculating the tax and tip separately and adding them. A and B calculate one percentage on a total that has already changed, so they do not use the required $6 base for both amounts.
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