Look at pic- To solve...
The bill at a restaurant comes out to be $80.00. If there is an
8% sales tax, and you would like to leave a 20% tip based on
the amount before tax, what is the final cost of the meal?
Tax: $80.00 x .08 = $6.40
Tip: $80.00 x 20 = $16.00
...find both percentages by
multiplying with the total....
Total: $80.00 $6.40 $16.00 = $102.40
... and add because the amount is increasing.