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Original: 72
New: 36
Since the new amount is greater than the original, this is a percent of increase.
The amount of change = New Amount – Original Amount.
The amount of change = .
Let r be the percentage of increase.
Use the original number, 72 as the base.
The percent proportion is
To solve for r, first find the cross products.
(Multiply: )
(Divide each side by 72)
(Cancel common terms)
(Divide: )
The percentage of decrease by 50%.
The percent of change is a percent of decrease.The percentage of decrease by 50%.
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