Table of Contents Topic Page #... 3.5/3.6 Ratios and Proportions41 3.7 Percents43 3.7B Solve Percent Problems45.

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Table of Contents Topic Page # /3.6 Ratios and Proportions Percents43 3.7B Solve Percent Problems45

#45 3.7B Solve Percent Problems

Ex 1: The survey results show that 33 of the 220 students choose macaroni and cheese for lunch. What percent is that?

Ex 2: The school survey shows that 40 out of 220 students bought lasagna for lunch on Friday. What percent is that? 11 5

Ex 3: In a school transportation survey of 225 students, 18 of the students said they walk to school. What percent of students walk to school?

Ex 4: After completing 10 laps in the Daytona 500, a driver has completed 5% of the race. How many laps does the race have? 2 1

Ex 5: A family spends $408 one month for food. This was 40% of its income. What was their monthly income?

Percent of change: Indicates how much a quantity increases or decreases with respect to the original amount

Percent of increase: New amount is greater than original amount

Percent of decrease: New amount is less than original amount

Ex 6: State whether each percent of change is a percent of increase or decrease. Then find the percent of change. Round to the nearest whole percent.

a. Original: 16New: 20 increase of

b. Original: 80New: 44 decrease of

Ex 7: Wendy worked for $6 an hour for the first month she was on the job. She was then given a raise to $6.24 an hour. What was the percent of her wage increase?

Ex 8: A car stereo that originally cost $175 was on sale for $150. What was the percent of decrease for the car stereo? (round to 2 decimal places) 7 1

Ex #9: Find the new amount. a. Increase 70 by 80%

Ex #9: Find the new amount. b. Increase 14 by 45%

Ex #9: Find the new amount. c. Decrease 40 by 20%

Ex #9: Find the new amount. d. Decrease 110 by 90%