A 25% increase followed by a 20% decrease

The original amount

Step-by-step explanation:

Let x equal our amount

We have a 25% increase

The increase is x*.25

The new total is the original amount plus the increase

new total = x+.25x

=1.25x

New we have the decrease

We have a 20% decrease

The decrease is 1.25x*.20

.25x

The new total is the original amount minus the decrease

new total = 1.25x -.25x

=x