The Hu family goes out for lunch, and the price of the meal is $45. The sales tax on the meal is 6%, and the family also leaves a 20% tip on the pre-tax amount. What is the total cost of the meal?

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Answer 1 · 2016-12-03T17:17:05

The total cost of the meal is $$56.70$ .

We shall first calculate the sales tax $(x)$ on the meal.

$x=45xx6/100$

$x=9cancel(45)xx6/(20cancel(100))$

$x=9xx(3cancel(6))/(10cancel(20))$

$x=27/10$

$x=2.7$

The sales tax works out to $$2.70$ .

We now calculate the tip $(y)$ on the pre-tax price of the meal.

$y=45xx20/100$

$y=45xx(1cancel(20))/(5cancel(100))$

$y=45/5$

$y=9$

The tip works out to $$9.00$ .

The total cost of the meal is:

$45+x+y=45+2.7+9=56.70$