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y-cena zakupu radia
10x+20y=6000/:10
x+2y=6000→x=600-2y
20% z 6000=0,2×6000=1200zł=zysk
10×15%x+20×30%y=1200
1,5x+6y=1200
1,5(600-2y)+6y=1200
900-3y+6y=1200
3y=1200-900
3y=300
y=300:3
y=100
x=600-2×100=600-200=400
odp. ceny hutrowe to :
telewizor:400zł, a radio 100zł