50% off coupon:
30% off sale with additional 20% off coupon:
c.
Which coupon will get her the lowest price?
Explain how you know your answer is correct.

124
3.3c Class Activity: More Practice with Percent Equations
1. Selina gave the waiter a $2.25 tip at the restaurant.
If her meal cost $12.50, what percent tip did she give?
a) Let
t
represent the percent of the tip.
Which of the following equations are true?
b) What is percent tip did she give?
Write an equation with a variable for each problem below, then solve the equation.
Justify your work.
2. Beatrice bought a new sweater.
She paid $3 in sales tax.
If sales tax is 6%, what was the original price of the
sweater?
3. Jill bought a bracelet that cost $5.
Sales tax came out to be $0.24.
What is the sales tax rate?
4.
Kaylee is training for a marathon. Her training regiment is to run 12 miles on Monday, increase that distance by
25% on Wednesday, and then on Saturday increase the Wednesday distance by 25%. How far will she run on
Saturday?

125
5.
Juan is trying to fit a screen shot into a report. It’s too big, so he reduces is first by 30%. It still doesn’t fit,
so he reduces that image by 20%. What percent of the original image did he paste into his report? If the
original image was 8 inches wide, how wide is the twice reduced image?
6.
The size of Mrs. Garcia’s class increased 20% from the beginning of the year. If there are 36 students in her
class now, how many students were in her class at the beginning of the year?
7.
Mika and her friend Anna want to give 20% of the money they make at a craft fair to charity. If Mika makes
$500 and they want to give a total of $150. How much will Anna have to make?

126
3.3c Homework: More Practice with Percent Equations
Write an equation with a variable for each problem. Then solve the equation.
Justify your answer.
1. John paid $3.45 in sales tax on his last purchase.
What was the original price if the tax rate is 3%?
2. Newt paid $45 in sales tax for his new television.
If tax is 6%, what was the original price of the television?
3. Carter gave the waitress a tip of $8.75.
If the original price of his meal was $24.95, what percent of the price
was the tip?
4. Louie paid a total of $12.55, with tax, for his new frying pan.
If the original price of the pan was $11.95,
what was the tax rate?
5. Robert paid $14.41, with tax, for his model airplane kit.
If tax was 6%, what was the original price of the kit?

127
3.3d Self-Assessment: Section 3.3
Consider the following skills/concepts. Rate your comfort level with each skill/concept by checking the box that
best describes your progress in mastering each skill/concept.
Skill/Concept
Beginning
Understanding
Developing
Skill and
Understanding
Deep
Understanding,
Skill Mastery
1.
Recognize and explain the meaning of a
given expression and its component parts
when solving problems with percents.
2.
Solve multi-step real-life percent problems
involving calculations with positive and
negative rational numbers in a variety of
forms.
3.
Convert between forms of a rational
number to simplify calculations or
communicate solutions meaningfully.

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- Fall '15
- Ms. Ginn
- Algebra, Addition, Equations, Algebraic Expressions, Commutativity, Associativity