Well it all depends on how much the bill is! If you don't have how much your going to pay you can't determine the tip.
$12.80
the answer is 48
3 dollars
8.60
15 % would be 2.06 to the nearest penny or cent.
51.75
The total would be 1.002 times the basic cost.
To tip for a facial, you can either give about 10 to 20 percent of the entire service cost, or you can tip a dollar amount that you feel is fair. Some people tip 10 dollars or 20 dollars regardless of the service price.
15-20 percent is the standard tip for services rendered.
10.80
3.03
2.40