Probably the quickest way:
Move the decimal point one place to the left - that will give you 10%.
Double the answer - that will be 20%.
So 20% of 42.30
step 1: 4.23
step 2: 8.46
Done!
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$40.26
If you have a calculator, multiply the bill amount by 0.15 If not: Take the amount of the bill. Move the decimal place one place to the left - that is 10% Halve that number - that is 5% Add the two together - and you've got 15% Simplicity! So, bill of 37.56 Step 1: 3.76 Step 2: 1.88 Step 3: 5.64
The tip would be 8.88 Divide the bill by 10 - giving 5.92. Divide that figure by 2 - giving 2.96 (this is 5% !) Add the two figures together, and the result is 15% of the bill.
If you'd like to leave an 18 percent tip on a $37.65 bill, the amount would be $6.78. However, most people would round that up to $7.00.
27 dollars... Your total bill would have been 162.00