Sec 3.4 Finding Rate

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Sec 3.4 Finding Rate

• Objectives
• Use the basic percent formula to solve for rate
• Find the rate of return when the amount of the
  return and the investment are known
• Solve for the percent remaining when the total
  amount used are given
• Find the percent of change

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Finding Rate

• As in Sec. 3.3, we can use our mnemonic device to
  help us remember the formula for finding rate.
• Part
• Rate --------
• Base

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Finding Rate

• When finding rate, always express your answer as
  a percent.

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• To find percent increase
• 1) First find the amount of increase by
  subtracting the smaller value from the larger
  value.
• Amt of Increase Larger - Smaller
• Value
  Value
• 2) Next, find the percent increase by dividing
  the amount of increase by the original amount.
• Increase
• 3) Finally, express your answer as a percent.

5

• To find percent decrease
• 1) First find the amount of decrease by
  subtracting the smaller value from the larger
  value.
• Amt of Decrease Larger - Smaller
• Value
  Value
• 2) Next, find the percent decrease by dividing
  the amount of decrease by the original amount.
• Decrease
• 3) Finally, express your answer as a percent.

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• We can summarize the above two sets of formulas
  into a single set of formulas-- use the context
  of the problem to determine whether it is a
  percent increase problem or percent decrease.
• Percent Change
• 1) Amount of Change
• Larger Value Smaller Value
• 2) Percent Change
• 3) Write your answer as a percent.

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Homework Sec 3.4 Divisible by 3