1. Percent Decrease SWBAT find the percent decrease; find the selling price for an item sold at a loss

2. Definition Percent Decrease How much an original amount is decreased How much an original amount is decreasedLoss When an item is sold below the cost When an item is sold below the cost

3. Think At the beginning of the year Samuel could run the full length of the basketball court in 10 seconds, by the end of the basketball season he could run it in 7.5 seconds. What is the percent decrease of his running time?

4. Examples From $5 to $4 From 0.7 to 0.07 Cost: $385.20Percent loss: 3.5% Cost: $79.25Percent loss: 3.4% A nursery bought spruce trees for $80 each. After the holidays, the nursery sold the trees that were left at a loss of 20%. What was the loss per tree?

5. Examples From 90.6 to 35.2 From 48 to 30 Cost $1200Percent loss: 32% Cost: $29.30Percent loss: 8.4% A runner ran one mile in 11 minutes. A year later she ran one mile in 8 minutes. What is the percent decrease in her running time?

6. Try These From 5.6 to 4.2 5.6 - 4.2 = 1.4 5.6 - 4.2 = 1.4 1.4/5.6 = x/100 1.4/5.6 = x/100 5.6x = 140 5.6x = 140 X = 25% X = 25% Cost: $30Percent loss: 63.2% x/30 = 63.2/100 x/30 = 63.2/100 100x = 1896 100x = 1896 X = $18.96 X = $18.96