Percent Off

1
Percent Off

• How to find
• Multiply (as decimal) times amount
• Subtract from original amount
• Example 35 off a 40 game
• 0.35 ? 40 14
• 40 14 26

2
Percent Off

• Find 28 off a 52 pair of jeans
• 0.28 ? 52 14.56
• 52 14.26 37.44
• (Round to 2 decimal places when working with
  money)

3
Percent Off

• Can add instead of subtracting if amount is
  increasing
• Ex. -gt increase 60 by 12
• 0.12 ? 60 7.2
• 60 7.2 67.2

4
Percent Off

• Guitar Hero U2 is coming out. The price is 75,
  but Target has it on sale the opening week for
  15 off. What is the sale price?
• 0.15 ? 75 11.25
• 75 11.25 63.75

5
Percent Off

• The ingredients for your FACS snack mix cost
  1.20 per serving. To make a profit, you
  increase that amount by 25 when you sell it.
  What is the selling price?
• 0.25 ? 1.20 0.30
• 1.20 0.30 1.50

6
Percent Off

• The cost of a pair of shoes was 62, but it
  decreased by 40. What is the new cost?
• 0.40 ? 62 24.80
• 62 24.80 37.20

7
Percent Of Change

• Given an old amount and a new amount
• To find the percent of change
• Subtract the two amounts to find the amount of
  change
• Divide the amount of change by the original
  amount
• Change decimal to percent, round to nearest
  percent
• ex. old 50, new 32
• 50 32 18 (amount it changed)
• 18 / 50 0.36 36

8
Percent Of Change

• Original amount 115, New amount 140
• 140 115 25
• 25 / 115 0.22 22

9
Percent Of Change

• A DVD normally costs 20, but Best Buy put it on
  sale for 17 to get more people to buy it. What
  was the percent of change?
• 20 17 3
• 3 / 20 0.15 -gt 15

10
Percent Of Change

• Last week the price of a gallon of gas was 2.65,
  but this week its 2.49 What is the percent
  decrease?
• 2.65 2.49 0.16
• 0.16 / 2.65 0. 06 -gt 6

11
Percent Of Change

• Twins tickets in the Metrodome normally cost 21,
  but the price is rising to 28 in the new
  stadium. What is the percent of change?
• 28 21 7
• 7 / 21 0.33 -gt 33

12
Homework Assignment

• p. 181 39
• p. 183 7-10,13,14
• Due Friday