Original: 40 hours
\New: 32.5 hours
\Since the new hours is greater than the original, this is a percent of increase.
\The amount of change = New hours – Original hours.
\ The hours of change = .
Let r be the percentage of decrease.Use the original number, 40 as the base.
\The percent proportion is
\To solve for r, first find the cross products.
\ (Multiply:
)
(Divide each side by 40)
(Cancel common terms)
(Divide:
)
The percentage of decrease by 18.75%
The percent of change is a percent of decrease.
\The percentage of decrease by 18.75%.