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# Finding the Percent of Increase and Decrease

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## Jill Nowak

on 19 February 2013

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#### Transcript of Finding the Percent of Increase and Decrease

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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