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4,40 * 0,75 = 3,30 - cena mandarynek
4. 0,032 * 0,25 = 0,008 ( zakładając że całe mleko to 1 litr)
(0.5x8.90)+(0.75x4.40)=4.45+3.3=7.75
zad4
0.032 - 1000g x - 250g
x = 0.008