Percent Increase and Decrease Concepts

This video tutorial covers the concepts of percent increase and decrease, explaining how to calculate them using a formula. It provides examples of calculating percent change in various scenarios, including salary raises and price changes. The tutorial also discusses the concept of compounding and its impact on percent change, and applies these concepts to practical situations like savings and shopping.

What is the formula for calculating percent change?

• Amount of change divided by the original amount

• Original amount divided by the amount of change

• New amount divided by the original amount

• Amount of change divided by the new amount

If Amber's hourly wage increased from $8 to $9.50, what is the percent increase?

• 15%

• 20%

• 18.75%

• 19%

The price of a pair of shoes increases from $52 to $64. What is the percent increase to the nearest percent?

• 20%

• 25%

• 27%

• 23%

David moved from a house 89 miles away to a house 51 miles away from his workplace. What is the percent decrease in distance?

• 45%

• 38%

• 42.7%

• 43%

Can a percent decrease be more than 100%?

• No, it is impossible

• Yes, if the original amount is very large

• No, unless the original amount is zero

• Yes, if the new amount is negative

The number of students in a chess club decreased from 18 to 12. What is the percent decrease?

• 30%

• 32%

• 33%

• 34%

Officer Brinbury wrote 16 tickets last week but only 10 this week. What is the percent decrease?

• 42.5%

• 37.5%

• 35.5%

• 40%

If the grizzly bear population increased by 115% from 270 in 1970, what was the population in 2005?

• 620

• 600

• 540

• 581

Why will the percent change always be represented by a positive number?

• Because the amount of change is always positive

• Because the greater number is always subtracted from the lesser number

• Because the formula uses absolute values

• Because the original amount is always positive

If an amount of $100 increases by 10% twice, what will be the final amount?

• $120

• $121

• $122

• $123