Final answer:
Jeff left a 14% tip on his bill. The tip percentage is obtained by dividing the tip amount by the original bill and then multiplying by 100. To find total bills with tips and taxes, convert percentages to decimals, multiply by the meal's cost, and add them to the bill.
Step-by-step explanation:
The student is asking about how to calculate the percentage of a tip left on the bill. In Jeff's scenario, he paid a total of $24.00 for a bill that was $21.00. To find out the tip percentage, we first determine the amount of the tip by subtracting the original bill from the total paid: $24.00 - $21.00 = $3.00. To find the percentage, we divide the tip by the original bill amount and then multiply by 100: ($3.00 / $21.00) × 100 = 14.29%. Rounding to whole numbers, Jeff left a 14% tip.
When calculating total bills involving tips and taxes, it's important to first convert the tax and tip percentages to decimals and multiply them by the cost of the meal. For taxes, we multiply the decimal tax rate by the meal cost to find the tax amount. For tips, we multiply the decimal tip rate by the meal cost to find the tip amount. Both the tax and tip amounts are added to the original bill to get the total amount paid when using a credit card. For instance, if the tax is 6% and the tip is 18%, we convert these to decimals (0.06 and 0.18) and calculate accordingly.