Understanding Percent Change

The video tutorial explains how to calculate the percent of change using a formula that involves subtracting the original amount from the new amount, dividing by the original amount, and multiplying by 100 to convert to a percentage. It provides examples of both increases and decreases, such as changes in quantities and prices, and explains how to interpret the results, including when to use negative signs.

What is the formula for calculating percent change?

• New amount divided by original amount

• New amount minus original amount divided by original amount times 100

• Original amount minus new amount

• Original amount plus new amount divided by 2

In a percent change calculation, which amount is considered the 'new' amount?

• The average of the two amounts

• The smaller amount

• The second amount

• The first amount

If a quantity decreases from 20 to 15, what is the percent change?

• 33.3% decrease

• 33.3% increase

• 25% increase

• 25% decrease

When calculating a percent decrease, why is the result negative?

• Because the original amount is smaller

• Because the formula is incorrect

• Because the new amount is larger

• Because the change is a decrease

If a quantity increases from 15 to 20, what is the percent change?

• 33.3% increase

• 33.3% decrease

• 25% increase

• 25% decrease

What does a positive percent change indicate?

• A constant quantity

• No change in quantity

• A decrease in quantity

• An increase in quantity

If the price of a latte drops from $3.12 to $2.83, what is the percent change?

• 10.2% decrease

• 10.2% increase

• 9.3% decrease

• 9.3% increase

In the context of percent change, what does a negative result signify?

• An error in calculation

• A decrease in value

• No change in value

• An increase in value

If the cost of gasoline rises from $2.83 to $3.12, what is the percent change?

• 10.2% increase

• 9.3% decrease

• 10.2% decrease

• 9.3% increase

What does a positive percent change in price indicate?

• The price has fluctuated

• The price has remained the same

• The price has increased

• The price has decreased