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#