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4 * 800zł + x = 5 * 960zł
x = 4800zl - 3200zł
x = 1600zł
(4 * 800 + x)/5 = 960
(3200 + x)/5 = 960
3200 + x = 4800
x = 1600
x = 960 + 4 * (960 - 800) = 960 + 4 * 160 = 960 + 640 = 1600
odp: Kucharz zarabia miesięcznie 1600zł.