Percent Increase/Decrease. Percent of change = amount of change (difference) original amount (what we started with) Percent of increase = original amount.

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Presentation transcript:

Percent Increase/Decrease

Percent of change = amount of change (difference) original amount (what we started with) Percent of increase = original amount goes up Percent of decrease = original amount goes down

Find the percent of increase or decrease from 20 to 24. % of change = amount of change = 24 – 20 = 4 original amount = 20 Set up proportion: 4 = X Cross multiply: 20(X) = 4(100) 20X = 400 Divide to get the variable alone: 20X = 400 X = 20% increase

Find the percent of increase or decrease from $49.60 to $ % of change = amount of change = $49.60 – $38.10 = $11.50 original amount = $49.60 Set up proportion: = X Cross multiply: 49.60(X) = 11.50(100) 49.60X = 1150 Divide to get the variable alone: 49.60X = 1150 X = 23% decrease

Find the percent of increase or decrease from 33 to 47 % of change = amount of change = 47 – 33 = 14 original amount = 33 Set up proportion: 14 = X Cross multiply: 33(X) = 14(100) 33X = 1400 Divide to get the variable alone: 33X = 1400 X = 42% increase

Find the percent of increase or decrease from 58 to 53 % of change = amount of change = 58 – 53 = 5 original amount = 58 Set up proportion: 5 = X Cross multiply: 58(X) = 5(100) 58X = 500 Divide to get the variable alone: 58X = 500 X = 8.6% decrease

YOUR TURN 1)Find the percent of increase or decrease from 8 to 4. 4 = X (X) = 4(100) 8X = 400 X = 50% decrease 1)2) Find the percent of increase or decrease from 79 to = X (X) = 15(100) 79X = 1500 X = 18.9% increase

YOUR TURN 1)Find the percent of increase or decrease from 174 miles to miles = X (X) = 38.1(100) 174X = 3810 X = 21.9% decrease 1)2) Find the percent of increase or decrease from 55 grams to 70 grams. 15 = X (X) = 15(100) 55X = 1500 X = 27.3% increase