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r. rata
1r. = 1/10x
2r. = 1/10x -10
3r. = 1/10x -20
4r. = 1/10x -30
5r. = 1/10x -40
6r. = 1/10x -50
7r. = 1/10x -60
8r. = 1/10x -70
9r. = 1/10x -80
10r. = 1/10x -90
11r. = 1/10x -100
12r. = 1/10x -110
12razy1/10x -(10+20+30+40+50+60+70+80+90+100+110) =x
1,2x-660zł=x
0,2x=660zł
x=3300zł
Odp.Cena komputera to 3300zł