Understanding Percent of Change

What is the definition of percent of change?

• The sum of the new and original amount.

• An increase or decrease expressed as a percent.

• The difference between the new and original amount.

• The ratio of the new amount to the original amount.

How do you calculate the percent increase from 32 to 40?

• Add 32 and 40, then divide by 2.

• Subtract 40 from 32, divide by 40, and multiply by 100.

• Subtract 32 from 40, divide by 32, and multiply by 100.

• Divide 40 by 32 and multiply by 100.

What is the percent decrease from 20 to 4?

• 80% increase

• 60% increase

• 80% decrease

• 60% decrease

When calculating percent decrease, why is the change negative?

• Because the original amount is subtracted from the new amount.

• Because the change is always positive.

• Because the original amount is larger than the new amount.

• Because the new amount is larger than the original amount.

If a bookstore sells a book for 28% more than it paid, what is the selling price if the cost was $5?

• $6.40

• $5.28

• $7.00

• $6.00

How do you calculate the selling price with a percent increase?

• Subtract the original price from the percent increase.

• Add the percent increase to the original price.

• Multiply the original price by the percent increase.

• Use the proportion method: change over original equals percent over 100.

What is the total cost of a meal priced at $32.75 with a 5% sales tax?

• $34.39

• $33.75

• $35.00

• $32.75

How can you calculate the total cost including sales tax?

• Subtract the sales tax amount from the original price.

• Add the sales tax percentage to the original price.

• Multiply the original price by the sales tax percentage.

• Add the sales tax amount to the original price.

If a toy is on sale for 20% off its original price of $3.80, what is the discounted price?

• $3.60

• $3.00

• $3.80

• $3.04

What is another method to find the discounted price of an item?

• Calculate 80% of the original price.

• Add 20% to the original price.

• Subtract 80% from the original price.

• Multiply the original price by 1.20.