Percent Increase and Percent Decrease. Percent of Change A PERCENT OF CHANGE is the percent a quantity increases or decreases from its ORIGINAL amount.

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Presentation transcript:

Percent Increase and Percent Decrease

Percent of Change A PERCENT OF CHANGE is the percent a quantity increases or decreases from its ORIGINAL amount.

Steps to Solve:

Example #1 Problem: Last year, a school had 632 students. This year the school as 670 students. Find the percent of increase in the number of students. Solution: a)Find the amount of change. b)Place the values in the ratio. c)Divide. d)Move 2 places to the right (x100).

Example #2 Problem: Find the percent markup for a car that a dealer buys for $10,590 and sells for $13,775. Solution: a)Find the amount of change. b)Place the values in the ratio. c)Divide. d)Move 2 places to the right (x100).

Example #3 Problem: Find the percent of discount for a $74.99 tent that is on sale for $ Solution: a)Find the amount of change. b)Place the values in the ratio. c)Divide. d)Move 2 places to the right (x100).

Example #4 Problem: The number of students enrolled in a school has increased from 1,938 to 2,128. A student calculates the percent of increase. His work is shown. Explain the student’s mistake and find the correct answer.

Example #5 Problem: A football player gained 1,200 yards last season and 900 yards this season. Find the percent of change. State whether the change is an increase or decrease.

Example #6 Problem: In a previous game the school’s star basketball player scored 25 points. In today’s game he scored 40 points. What was the percent of change in the player’s scoring? Is the change an increase or decrease?