To find the cost after a 6% tax and a 15% tip, we need to multiply the amount by these two percents. Add the percents together to make the math easier.
$27.65 x 0.21 = $5.81
Now, add that number to the original cost to get the answer
$27.65 + $5.81 = $33.46
The cost of a $27.65 bill after a 6% and 15% tip is $33.46
