Pre-algebra

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# Pre-algebra - PowerPoint PPT Presentation

Pre-algebra. Quiz 7B -Applications of Percent . Write 12.5% as a decimal. .125. Write 6.5% as a decimal. .065. Translate the following sentence into an equation: 18 is 44% of what number?. 18 = .44n. Translate the following sentence into an equation: 104 is 36% of what number?. 104 = .36n.

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### Pre-algebra

Quiz 7B -Applications of Percent

15 is what percent of 85?

15 = 85p

15 = 85p

85 85

.17647 = 17.6%

44 is what percent of 120?

44 = 120p

44 = 120p

120 120

.3666 = 36.7%

62 - 44 = x

44 100

18 = x

44 100

1800 = 44 x

X = 40.9% increase

• A price change from \$44 to \$62.

56 - 42 = x

56 100

14 = x

56 100

1400 = 56 x

X = 25% decrease

• A price change from \$56 to \$42.

165 - 122 = x

165 100

43 = x

165 100

4300 = 165 x

X = 26.1% decrease

• Weight change from 165 lbs to 122 lbs.

132 - 112 = x

112 100

20 = x

112 100

2000 = 112 x

X = 17.9% increase

• Weight change from 112 lbs to 132 lbs.

A car salesman was able to sell a car for \$14,500. He earned 6% commission on the sale. How much was his commission?

X= 14,500(.06)

X = \$870

A relator was able to sell a house for \$167,500. He earned 5% commission on the sale. How much was his commission?

X = 167500(.05)

X= \$8,375

Janet earns 8.5% commission on her clothing sales. If she wants to earn \$100 commission, how much must she sell?

100 = .085x

X = \$1,176.47

Jack worked his first week at Hershey Park. He earned a total of \$162.50. He was disappointed to see that \$20.20 was withheld for taxes. What percent of his check was withheld?

20.2 = 162.5x

X= .124307 = 12.4%

In 2002, the average monthly price for cell phone plans was \$78.50. Because of data plans, the cost has increased 44.5% per month. What is the new average monthly cost?

X = 44.5

78.5 100

100x = 3,493.25

X = 34.93

34.93+ 78.50

\$113.43