To determine the minimum percent you can tip using a $5 bill at the restaurant, calculate the total bill with tax, find 20% of the pre-tax bill, and then determine the percent that $5 represents of the pre-tax bill, which is 27.0% rounded to the nearest tenth.
To calculate the minimum percent you can tip at the restaurant using only $5 bills, let's first calculate the tax on your bill. The total bill before tax is $18.53, and the tax is 6%. To find the tax amount, you multiply the bill by the tax rate in decimal form:
$18.53 × 0.06 = $1.11 (rounded to the nearest cent)
Add the tax to the initial bill to find the total amount you would need to pay before tipping:
$18.53 + $1.11 = $19.64
To tip at least 20% of $18.53, you calculate:
0.20 × $18.53 = $3.71
Since you only have $5 bills and want to leave at least a 20% tip, you would leave one $5 bill as a tip. Now we'll calculate the percent this $5 represents of your initial bill:
$5 ÷ $18.53 = 0.2699 or 27.0% (rounded to the nearest tenth)
Therefore, the minimum percent you can tip using a $5 bill, to the nearest tenth of a percent, is 27.0%.