Calculating Percentages (125/96) -- Carpentry Refresher Program Manual

Calculating Percentages Percentages are used when calculating a variety of things, from tax, to mark-up, to material allowances. To perform this task, you must remember that: - To convert a percentage to decimal, divide by 100 or move the decimal to the left two times - To convert a decimal to a percentage, multiply by 100 or move the decimal to the right two times. Example Calculating Percentages Using Decimals Calculate a 5% increase in a length of 4400 m. Convert 5% to a decimal: Multiply the decimal by the length: Add the length to the original length for a total length: Example Calculating Percentages Using the Percent Button Calculate 11% tax on a bill of $78.95 Use the following keystrokes: $78.95 + 11 = The answer is $87.63. The percent button automatically converts a number to percent. When the percent button is pressed, the percentage amount is displayed. When the equal button is pressed the total amount (original plus percentage) is displayed. When calculating a discount, press “-“ instead of “+”