A hand-painted wallpaper costs $400 at the market. A DIY will saves 20% after considering the materials cost. If Ethan made his own hand-painted wallpaper, how much was the total cost?
A DIY will saves 20% after considering the materials cost, meaning you will save 20/100*$400=$
<gadget id="calculator">20/100*400</gadget>
<output>80</output>
80 if you make your own hand-painted wallpaper.
The total cost of a hand-painted wallpaper made at home is $400-$80 = $
<gadget id="calculator">400-80</gadget>
<output>320</output>
320.

<result>320</result>