1. 5.4 Applications of Percent
I can find and estimate solutions to application problems involving percent and use different ways to represent a situation.

2. Finding Sales Tax
A video game costs $ The sales tax rate is 5.5%. How much will you pay for the video game?
Find the sales tax
A = 0.055(34.98) and round to the nearest hundredth
A ≈ 1.92
Add to the original cost
$ $1.92 = $36.90 (the total cost)

3. Estimating a Tip Use estimation to calculate a 15% tip for $34.50.
Round to the nearest dollar
$35
Find 10% of the bill: 0.1(35) = $3.50
Find 5% of the bill. 5% is ½ of the 10% amount
$1.75
Add 10% amount and 5% amount to get $5.25
A 15% tip for $34.50 is about $5.25

4. Finding a Commission
Find the commission on a $300 sale, with a commission rate of 8.5%
A = 0.085(300)
$25.50

5. Practice
Find the total earnings for a salesperson with a salary of $550 plus 4% commission on sales of $1,485.
total earnings = salary + commission
(1485)
$609.40

6. Percent Error in Manufacturing
A 625-g mass measures g. What is the percent error?
Percent error = 𝑏𝑖𝑔𝑔𝑒𝑟 𝑣𝑎𝑙𝑢𝑒−𝑠𝑚𝑎𝑙𝑙𝑒𝑟 𝑣𝑎𝑙𝑢𝑒 𝑎𝑐𝑡𝑢𝑎𝑙 𝑣𝑎𝑙𝑢𝑒 ∙ 100
Percent error = − ∙ 100
Percent error = ∙ 100 = %
Round to nearest hundredth: 0.03%

7. Assignment
ODDS
P.195 #9-27