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I - x / 40
II - x+0,20x / 40+8=48
razem - 88
x+(0,20x+x)=88
2,20x=88 | *100
220x=8800 | :220
x = 40
20/100 * 40 = 8
spr.
40+48=88
Odp. Kosztowała 48zł.
2,20x=88 | *100
220x=8800 | :220
x = 40
20/100 * 40 = 8