Answer:
$494.40
Explanation:
The computer was sold to the computer store for $370.80
"The price they was selling at was $618
But is now at a 20% markdown"
First you find out how much the price went down
618 x 20%
20% --> .20
618 x .2 = 123.6
Then you subtract that to the number it was originally at
618 - 123.6 = 494.4