Original: 92

New: 21

Since the original amount is greater than the new, this is a percent of decrease.

The amount of change = New amount– Original amount.

The amount of change = .

Let r be the percentage of increase.

Use the original number, 16 as the base.

The percent proportion is

To solve for r, first find the cross products.

Divide each side by 92.

The percentage of decrease by 77%.

The percent of change is a percent of decrease.The percentage of decrease by 77%.