7th Math Topic 3 Review

3-1: Analyze Percents

100

What is 25% as a decimal?

0.25

200

What is 80% of 260?

208

300

What is 160% of 98?

156.8

400

What is 0.8% of 1046?

8.368

500

A company charges a shipping fee that is 4.5% of the purchase price for all items it ships. What is the fee to ship an item that is $56?

$2.52

3-2: Percent Proportions

100

What is a proportion?

Two fractions set equal to each other.

200

Solve the following proportion for x: 

4/20 = x/180

x = 36

300

Solve the following proportion for x: 

45/12 = x/66

x = 247.5

400

On Thursday, a restaurant serves iced tea to 35 of its 140 customers. What percent of the customers order iced tea?

25%

500

40/160 = 85/x

x = 340

3-3: Percent Equation

100

Fill in the blank:

Part = ________ x Whole

Percent

200

Solve for the Part: 

Part = 0.62 x 850

Part = 527

300

Michael earns a 6% commission on each house he sells. If he sells a house for $180,000, how much does he earn in commission, c?

$10,800

400

Solve for the Whole: 

140 = 0.8 x Whole

Whole = 175

500

Sharon paid $78 sales tax on a new camera. If the sales tax rate is 6.5%, what was the cost of the camera?

$1200

3-4/3-5: Percent Change

100

Find the Percent Change: 

Original Amount: 80

New Amount: 100

25% increase

200

Find the percent increase or decrease: 

Original Amount: 150 

New Amount: 120

20% decrease

300

Juan’s puppy weighed 16 pounds at the age of 2 months. The puppy weighed 60 pounds at the age of 8 months. What is the percent change in the puppy’s weight?

275%

400

Hank buys a used car for $7,200 and plans to sell it on his used car lot. What is the price of the car after a markup of 15%

$8280

500

Nya wants to buy a sweater that had an original price of $55. The sweater is now discounted 20% and the sales tax rate is 5.5%. How much will Nya pay for the sweater?

$46.42

3-6: Simple Interest

100

What is the Simple Interest Equation?

Interest = Principal x Rate

200

Find the interest if the principal = $3,000 with 25% interest. 

(Hint: I = p x r)

$750

300

Yuni loaned $400 to her brother. He will repay the loan by paying 2.5% simple interest for 3 years. How much will he pay in interest?

$30

400

Solve for the interest rate: 

$450 = $1250 x r

36% interest

500

Kelly opened a bank account that earns 1.2% simple interest each year. After 7 years, Kelly will earn $126 in interest. How much did Kelly deposit when she opened the account?

$1500