The Hu family goes out for lunch, and the price of the meal is $57. 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?

$71.82

Step-by-step explanation:

57 = original price

Sales tax = 6%. To find 6% of 57, we can first convert 6% to a decimal and then multiply that by the original amount. To convert 6% to a decimal, we divide by 100. 6/100 = 0.06. 0.06 * 57 = 3.42 as the sales tax.

Similarly, the percent tip as a decimal is 20/100 = 0.2. The tip amount is thus 0.2 * 57 = 11.4. Note that we multiply by 57 because that is the pre-tax amount.

Add these three values up to get

57 + 3.42 + 11.4 = 71.82