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y-bluzka
50x+40y=4000
150%*50x=120%*40y
75x=48y
75x=2000
x=26,6
48y=2000
y=41,6
x+y=26,6+41,6=68,2
y-cena bluzki
50x+40y=4000
50x+0,5*50x=40y+0,2*40y
40y=4000-50x /:40
50x+25x=40y+8y
y=100-1,25x
75x=48y
75x=48*(100-1,25x)
75x=4800-60x
75x+60x=4800
135x=4800 /:135
x=35,56
75*35,56=2667
48y=2667 /:48
y=55,56