Question

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?

Answer 1

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

Explanation:

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`