human
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?
assistant
How much will a DIY save? ** A DIY will saves 20% after considering the materials cost, meaning you will save 20/100*$400=$<<20/100*400=80>>80 if you make your own hand-painted wallpaper.
How much will a hand-painted wallpaper made at home cost? ** The total cost of a hand-painted wallpaper made at home is $400-$80 = $<<400-80=320>>320
#### 320