Start with the bill without sales taxes. Divide by 5. That's a 20% tip. You can also take the pre-tax number, move the decimal point one position to the left and divide by 2. Same result.
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$25.28
3.34
"Percent" means "out of every hundred".So 20 percent of 100 is 20.
Not a lot to go on here. If the meal was 20 dollars and the tip was 7 dollars, that's 35 percent. Very generous. If the 7 dollar tip was 20 percent of the meal, the meal was 35 dollars.
$10.40