Percentages

• How to do you find x percent of y ?

  ● write the x percent as a decimal

  ● multiply the y by the x percent as a decimal to get your answer
• How do you find a new amount after a percent increase/decrease?

  ● write the percent (x) as a decimal

  ● multiply to find x of the cost

  ● if the number is smaller than the original cost subtract it if the number is larger than the original cost add it
• How do you express x as a percentage of y?

  ● make sure both amount are in the same units

  ● divide x by y then multiply by 100
• What is the formula for giving a change in value as a percentage?

  Percentage 'change' = 'change / original × 100