def summer_rabatt(vareliste, f?rpris, nypris):
    rabatt = 0

    for vare in vareliste:
        differanse = f?rpris[vare] - nypris[vare]
        rabatt += differanse

    return rabatt

vareliste = ['laptop', 'ryggsekk']
f?rpris = {'laptop':5000, 'ryggsekk':900}
nypris = {'laptop':4000, 'ryggsekk':600}

print(summer_rabatt(vareliste, f?rpris, nypris))