Answer:
It would depend of what your bill is.
Explanation:
Here is how to find the tip of a bill.
Move the decimal, then double the number.
Move the decimal point in your pretax bill one place to the left to get $5.375 from $53.75.
Round up to the next easy number: $5.40.
Double that number to get $10.80, which is 20% of your original bill.