Answer
The computer's price before the reduction is $ \$2250 $.
Work Step by Step
Let $x$ represents the computer's price before the reduction.
$20\%$ of the computer's price is $=(0.20)x$.
The price of the computer after reduction is $ \$ 1800$.
In mathematical form.
$x−0.20x=1800$
$(1−0.20)x=1800$
$0.80x=1800$
$x=\frac{1800}{0.80}$
$ x=2250 $
