Finding Percent of Decrease Finding the Percent of

Increase and Decrease 1.) Find the amount of decrease

2.) Amount of Decrease

Original Amount

3.) Example:

Original cost = $100, Sell Price = $70

Amount of decrease 100 - 70 = 30

30

100 Finding Percent of Increase 1.) Find the amount of increase

2.) Amount of Increase

Original Amount

3.) Example:

Original cost = $40, New Price = $68

Amount of increase 68 - 40 = 28

28 7

40 10 You Try! Finding the New Price = = = 1.) Find the percent of decrease (if needed, round to the nearest whole number:

Original Price = $192, Sell Price = $125

2.) Find the percent of increase:

Original Price = $43, New Price = $65 Step 2) Add amount of increase to original amount

or

Subtract amount of decrease from original amount

$1800

- $630

$1170 Step 1) Multiply the original # by the % of change

Original price = $1,800

% of decrease = 35%

New price = ?

1,800 x .35 = $630 is the amount of decrease Increase

Original Price = x Use this trick to solve

% of increase = 14% is %

new price = $238 of 100

1.) Write an equation:

100%

+ 14% 238

114% Decrease

Original Price = x Use this trick to solve:

% of decrease = 15% is %

new price = 136 of 100

1.) Write an equation:

100% 136 is 85% of what?

-15%

85% 100 Finding the Original Price = = Finding the Original Price = =

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# Finding the Percent of Increase and Decrease

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