4 ms·
Multiply by .10 by moving the decimal on the bill. So 15.23 would be 1.523 and then just double it - 3.0 for a 20% tip.
by 2snakes 5y ago
Multiply by .10 by moving the decimal on the bill. So 15.23 would be 1.523 and then just double it - 3.0 for a 20% tip.