Percent Change and Interest Concepts

This video tutorial covers the concepts of percent increase and decrease, explaining how to calculate these changes using a formula. It provides examples, such as wage increases and distance decreases, to illustrate the calculations. The tutorial also discusses the limits of percent change, emphasizing that while increases can exceed 100%, decreases cannot go beyond 100%. Additional examples, including compounding interest and price changes, are provided to reinforce understanding.

What is the formula for calculating percent change?

• New amount divided by the original amount

• Amount of change divided by the original amount

• Original amount divided by the amount of change

• Amount of change divided by the new amount

If a salary increases from $8 to $9.50, what is the percent increase?

• 20%

• 19%

• 18.75%

• 15%

What does a 100% increase mean?

• The amount doubles

• The amount triples

• The amount remains the same

• The amount increases by 50%

Why can't a percent decrease be more than 100%?

• Because it would mean the amount is unchanged

• Because it would mean the amount is zero

• Because it would mean the amount is doubled

• Because it would mean the amount is negative

If the distance from home to work decreases from 89 miles to 51 miles, what is the percent decrease?

• 42.7%

• 43%

• 44%

• 45%

What is the percent decrease if the number of students in a club drops from 18 to 12?

• 35%

• 33%

• 30%

• 40%

What is the difference between a 10% increase twice and a single 20% increase?

• The 20% increase results in a higher final amount

• The 10% increase twice results in a higher final amount

• They both result in a lower final amount

• They result in the same final amount

How does compound interest differ from simple interest?

• Compound interest is calculated once

• Simple interest grows on itself

• Compound interest grows on itself

• Simple interest is calculated multiple times

If a TV originally costs $499 and is increased by 10%, what is the new price?

• $550.00

• $551.00

• $549.90

• $548.90

What is the new price of a $499 TV after a 30% decrease?

• $351.00

• $352.00

• $350.00

• $349.30