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x - zarobki nowego pracownika
Mamy
[ 21 * 3000 + x] / [ 21 + 1 ] = 3030
[ 63 000 + x] / 22 = 3030
63 000 + x = 3030 * 22 = 66 660
x = 66 660 - 63 000 = 3 660
Odp. Nowy pracownik zarabia 3 660 zł.