Section 2.7 + 2.8: Percentages & Percent Of Change

Multiple Choice

Solve the equation:

$$3x-\left(x-4\right)=2x$$  

• 2

• -2

• -4/5

• No Solution

Multiple Choice

Solve the equation:

$$4+6c=6-4c$$  

• 1

• 1/5

• 5

• No Solution

Multiple Choice

What percent of 350 is 28?

• 28%

• 8%

• 0.08%

• 12.5%

Multiple Choice

What percent of 63 is 18?

• 29%

• 3.5%

• 18%

• 45%

Multiple Choice

What is 12% of 80?

• 9.6

• 12

• 960

• 6.667

Multiple Choice

What is 78% of 245?

• 18,375

• 0.3184

• 191.1

• 314.1

Multiple Choice

45% of what number is 43.2?

• 0.96

• 45

• 96

• 2.222

Multiple Choice

56% of what number is 44.8?

• 1.786

• 125

• 4480

• 80

Multiple Choice

What is the correct way to set up the second question?

• $$\frac{30}{5}=\frac{a}{100}$$  

• $$\frac{5}{a}=\frac{30}{100}$$  

• $$\frac{a}{5}=\frac{30}{100}$$  

• $$\frac{5}{30}=\frac{a}{100}$$  

Multiple Choice

What is the answer to the first question?

• 113%

• 769%

• 13%

• 77%

Multiple Choice

Which setup does NOT work to solve the third question?

• $$100\cdot15=45p$$  

• $$\frac{15}{45}=\frac{p}{100}$$  

• $$p=\frac{15\cdot100}{45}$$  

• $$\frac{45}{15}=\frac{p}{100}$$  

Multiple Choice

If there is a percent increase, how should the new value compare to the original value

• The new value is less than the original value

• The new value is greater than the original value

Multiple Choice

If the new value is less than the original value, how does the percent change?

• Percent decrease

• Percent increase

Multiple Choice

Which formula represents a percent increase?

• $$P\%=\frac{new\ amount-original\ amount}{original\ amount}$$  

• $$P\%=\frac{original\ amount-new\ amount}{original\ amount}$$  

Multiple Select

Of the questions listed here, which indicate a percent increase?

(Select all that apply.)

• a)

  Original amount:

  6

  New amount:

  10

• b)

  Original amount:

  105

  New amount:

  95

• c)

  Original amount:

  35

  New amount:

  27

• d)

  Original amount:

  45.5

  New amount:

  65

Multiple Choice

A dress is on sale. The original price is $130. The sale price is $97.50. What is the discount expressed as a percent change?

• 32.5% decrease

• 25% decrease

• 97.5% decrease

• 32.5% decrease

Multiple Choice

A music store buys a saxophone for $2800. The store then marks up the price of the saxophone to $3500. What is the mark up expressed as a percent change?

• 700% increase

• 125% increase

• 7% increase

• 25% increase