To calculate tips fast, you can use mental math and rounding techniques. Here are a few tips:
Round the bill amount: Round the bill amount to the nearest whole number, which will make it easier to calculate the tip mentally. For example, if the bill amount is $47.50, round it up to $48.
Use a standard percentage: Use a standard percentage, such as 15%, 18%, or 20%, depending on the quality of service you received and your personal preference.
Calculate the tip amount: To calculate the tip amount, simply multiply the rounded bill amount by the standard percentage. For example, if the bill amount is $48 and you want to leave a 20% tip, multiply $48 by 0.20, which equals $9.60.
Add the tip amount to the bill amount: To find the total amount due, add the tip amount you calculated in step 3 to the original bill amount. For example, if the bill amount is $48 and the tip amount is $9.60, the total amount due is $57.60.
By rounding the bill amount and using a standard percentage, you can quickly calculate the tip amount and total amount due in your head. With practice, you can become even faster at mental math and calculate tips almost instantly.