Using Proportions to Solve Percent Problems
Calculating Tips and Simple Interest and Proportions
Calculating Sales Tax
Percent Increase and Percent Decrease
100

The number 88 is 88% of what number?

88/x=88/100


100

100
Shelly wants to leave an 18% tip for her meal. If her meal cost $25.10, what should be the total she pays, including the tip?

$25.10 (1 +.18) = $29.62


100

Karen buys a sweatshirt for $30. The sales tax in her state is 7%. What is the total amount Karen will pay for the sweatshirt, including sales tax? 

$32.10
100
Haley has a collection of necklaces. Last month, she had 40 necklaces. She now has 76 necklaces. What is the percent change in the number of necklaces in Haley's collection from last month to now? 
90% increase
200

Samantha raises animals and trains them to appear in Hollywood movies. Currently, 23 of her penguins are appearing in a film about climate change. That is 92& of the penguins Samantha has raised. How many penguins has she raised? 

25 penguins

92/100=23/x

200

Yolanda always tips her hair stylist 22% of whatever her services cost. On her most recent trip to her hair stylist, the services Yolanda received cost $150. What amount should Yolanda tip her hair stylist? 

$150 (.22)= $33

200

Bexley bought a t-shirt while on vacation for a total of $32.46 including sales tax. the price tag on the shirt was $29.99. What percent was the sales tax for the T-shirt? 

8.24%

200

Last month, you joined an online strategy game. When you joined, there were 25 members. This month, there are 47 members. What is the percent change in the number of members from last month to this month? 

88% increase

300

What is 54% of 450

243


54/100=x/450

300

Aira has a monthly budget that breaks down as follows: 30% for rent, 10% for food, 15% for utilities, 25% for savings, 5% for entertainment, and 15% for personal items. Aira has a net income of $3,500 each month. 

Calculate the amount of money that Aira has each month for personal items

$525

300

Drasen went to the store to pick out a new game. The game had a price tag of $27.98, and he paid $29.94 at the register. What percent is the sales tax in his state? 

7%. 

300
The peach tree in Anthony's backyard produced 56 pounds of peaches in one summer. The next summer, it produced 14 pounds less than the previous year. What is the percent change in the number of pounds of peaches produced from one summer to the next? 
25% decrease
400

The number 57 is 76% of what number? 

75

57/x=76/100

400

Last month, Marcus spend $480 on food and going out to eat. What percent of his monthly income did he spend on food? 

Marcus spent approximately 11.4% of his income on food.

400

Stuart spent $91.77 after sales tax on a new golf club. If the sales tax was $6.99, what percent is the sales tax in his state? 

8.25%

400
Your playlist has 40 songs on it. You add 10% more songs to it. How many songs are in your playlist now? 

44 songs

500

Jonah is saving up to purchase a small flat-screen television for his bedroom. He has saved $80, which is 64% of the total cost of the television. How much does the television cost?

solve for x. 

80/x=64/100

x= 125

500

Tak deposits $2,000 into a savings account that earns simple interest. The bank applies the interest to his account at the end of each year. Complete the table

Year       Principal           I. Rate         I. Earned

1            $2,000                2%               

2             $2,040              2%                 

3             $                       3%               

Year 1, I earned is $40 

Year 2, $40.80

Year 3, principal is $2080.80

Year 3 interest earned is $62.42

500

Rachel has a coupon for 15% off any two pairs of earrings at one of her favorite stores. If each pair of earrings that she purchased cost $12.99, and the sales tax in her state is 6.5%, what is the total amount she spent after using her coupon? 

$23.52

500

Matthew is scaling down a photograph that has an area of 8 square inches. He plans to reduce its area by 25%. What will be the area in square inches of the reduced photograph? 

6 square inches.

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