Exploring Percent Increase and Decrease Methods

Mr. Buffington explains percent increase, decrease, and change, using examples like salary and car value. He demonstrates how to calculate these changes and solve word problems involving percents. The video covers methods for adding percents to amounts and provides both beginner and advanced techniques. The lesson concludes with a recap of the key concepts discussed.

What is the formula for calculating percent change?

• Original amount divided by the new amount, multiplied by 100

• Original amount divided by the change amount, multiplied by 100

• Change amount divided by the original amount, multiplied by 100

• Change amount divided by the new amount, multiplied by 100

John's salary increased from $30,000 to $31,500. What is the percent increase?

• 4%

• 7%

• 5%

• 6%

A car was bought for $10,000 and sold for $3,000. What is the percent decrease?

• 70%

• 60%

• 65%

• 75%

How do you calculate the amount of change if not given directly?

• Subtract the original amount from the new amount

• Add the original amount to the new amount

• Multiply the original amount by the new amount

• Divide the original amount by the new amount

What is 75 increased by 30%?

• 100.5

• 99.5

• 97.5

• 95.5

Which of the following is a shortcut method to find 130% of 75?

• 0.3 times 75

• 1.3 times 75

• 0.13 times 75

• 1.03 times 75

What is the decimal equivalent of 30%?

• 3.0

• 0.003

• 0.03

• 0.3

A video game costs $50 with a 6% sales tax. What is the total cost?

• $55

• $53

• $52

• $54

If a salary of $65,000 is increased by 4%, what is the new salary?

• $67,600

• $67,500

• $68,000

• $67,000

What is the shortcut method to find the total cost including a 6% tax?

• 1.06 times the original cost

• 0.06 times the original cost

• 1.6 times the original cost

• 0.16 times the original cost