Percent Decrease and Price Comparison

The video tutorial explains how to calculate the percent decrease in the price of a water bottle that originally cost $1.25 and is now on sale for $1. Two methods are demonstrated: one using a visual approach with quarters and another using a formal calculation method. The visual method simplifies the problem by comparing the price in terms of quarters, while the formal method uses the formula for percent change, which involves finding the difference, dividing by the original price, and converting to a percentage.

What was the original price of the water bottle last week?

• $1.50

• $1.00

• $0.75

• $1.25

What is the sale price of the water bottle this week?

• $1.50

• $0.75

• $1.25

• $1.00

How many quarters is $1.25 equivalent to?

• 4 quarters

• 3 quarters

• 6 quarters

• 5 quarters

What is the percent decrease when the price drops from 5 quarters to 4 quarters?

• 10%

• 15%

• 20%

• 25%

What is the main advantage of the first method using quarters?

• It is faster for complex numbers.

• It is easier with simple numbers.

• It requires no calculations.

• It is more accurate.

What is the amount lost when the price decreases from $1.25 to $1.00?

• $0.10

• $0.15

• $0.20

• $0.25

What is the formula for percent change?

• Difference divided by original

• Original divided by difference

• Difference multiplied by original

• Original minus difference

Why do we multiply by 100% in the percent change formula?

• To convert to a whole number

• To convert to a percentage

• To convert to a decimal

• To convert to a fraction

What is the percent decrease when the difference is 25 and the original is 125?

• 25%

• 20%

• 15%

• 10%

What is the benchmark fraction for a 20% decrease?

• 0.3

• 0.2

• 0.1

• 0.4