Understanding Percentages and Increases

The video tutorial covers the basics of percent concepts, including converting between percent and decimal forms. It explains how to calculate percent increase and decrease using real-life examples, such as wage increases and distance reductions. The tutorial also demonstrates how to apply percent change calculations to solve problems involving population growth and price adjustments.

What does 85% represent in terms of a fraction?

• 85/100

• 0.85/1

• 8.5/10

• 850/1000

How do you convert 0.85 to a percentage?

• Multiply by 10

• Move the decimal two places to the right

• Divide by 100

• Move the decimal two places to the left

Amber's wage increased from $8 to $9.50. What is the percent increase?

• 20%

• 19%

• 18.75%

• 15%

If a salary doubles, what is the percent increase?

• 150%

• 100%

• 200%

• 50%

David moved closer to work, reducing his commute from 89 miles to 51 miles. What is the percent decrease?

• 48%

• 43%

• 50%

• 38%

What does a 100% decrease imply?

• The value is unchanged

• The value is zero

• The value is halved

• The value is doubled

The grizzly bear population increased by 115% over 35 years. What was the population in 2005 if it was 270 in 1970?

• 621

• 581

• 311

• 270

How do you calculate the new price of an item after a 10% increase?

• Subtract 10% from the original price

• Multiply the original price by 1.1

• Add 10 to the original price

• Divide the original price by 0.9

If a TV costs $499 and the price increases by 10%, what will be the new price?

• $549.90

• $499

• $599

• $548.90

What is the first step in calculating a percentage increase?

• Multiply by 100

• Divide by the new amount

• Find the amount of change

• Find the original amount