Proportional Relationships and Percentages

What is the percent of increase for a population that changed from 438,000 to 561,000 to the nearest hundredth?

• 28.08% increase
• 28.08% decrease
• 28% increase
• 23% increase

A merchant buys a television for $125 and sells it for a retail price of $200. What is the markup rate?

• 40% increase
• 60% increase
• 60% decrease
• 40% decrease

In 1950, the population of a city was about 800,000 people. Over the next 50 years, the population increased to 1.3 million. Find the percent of increase.

• 63% increase
• 60% decrease
• 60% increase
• 62.5% increase

A shopper bought shoes marked $45. The sales tax is 6.5%. How much did the shopper pay in all?

• $2.93
• $42.07
• $47.93

A keyboard that costs $475 is marked down 15% for a sale. What is the reduced price of the keyboard?

• $71.25
• $403.75
• $546.25

In a science experiment 12 grams of salt crystals were left out in an open dish. After 24 hours, the total mass of the crystals had increased to 14.76 grams.  What is the percent of change over the 24 hours?

• 2.3% decrease
• 2.3% increase
• 23% decrease
• 23% increase

Nichole wanted to buy a purse that originally costs $39.95, but was on sale for 60% off.  If the sales tax rate was 8.25%, calculate the final price that she would pay, including sales tax. 

• $15.98
• $23.97
• $17.30
• $1.32

A store bought a sofa wholesale for $200 and marked it up 15%. When the sofa didn’t sell, they reduced the price 15%. Show why the current price is not $200.

• Because the markup price is $210, and the markdown is $34.50, so current price is $185.50
• It is $200.
• Because the markup price is $230, and the markdown is $34.50, so current price is $195.50

A business bought a lot of 2,500 lamps for fifty thousand dollars and wants to sell them at a 15% profit. How much should each lamp cost? 

• $15
• $23
• $25
• $230

$5,000 was invested at a simple interest rate. In 15 years, the account was worth $6500. What was the interest rate?

• 2%
• 20%
• 15%