Calculating Percent Change with Proportions

The video tutorial explains how to find the percent change using a proportion, using the example of an increase in gas prices from 79 cents to $2.39 per gallon. It covers calculating the difference, setting up and solving the proportion, and understanding the result. The tutorial also discusses rounding the result to various decimal places.

What is the initial cost of gas per gallon mentioned in the problem?

• 79 cents

• 1.60 dollars

• 2.39 dollars

• 1.00 dollar

What is the new cost of gas per gallon mentioned in the problem?

• 79 cents

• 1.60 dollars

• 1.00 dollar

• 2.39 dollars

How do you find the difference between the original and new gas prices?

• Divide the new price by the original price

• Subtract the original price from the new price

• Multiply the two prices

• Add the two prices

What is the difference between the original and new gas prices?

• 1.60 dollars

• 2.39 dollars

• 79 cents

• 1.00 dollar

In the proportion set up to find the percent change, what is placed over the original price?

• The difference between the prices

• The new price

• The percent change

• 100

What is the original price used in the proportion?

• 2.39 dollars

• 1.60 dollars

• 79 cents

• 1.00 dollar

What is the calculated percent change before rounding?

• 300%

• 100%

• 150%

• 202.53%

Why does a percent change greater than 100% make sense in this context?

• Because the new price is the same as the original price

• Because the new price is more than double the original price

• Because the new price is exactly double the original price

• Because the new price is less than the original price

If you round the percent change to the nearest whole number, what is the result?

• 200%

• 202%

• 205%

• 203%

Which rounding place would result in a percent change of 202.53%?

• Tenths place

• Hundredths place

• Thousandths place

• Whole number