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8 szyling. + 6 pens. = 12*8+6 = 102 pensy
100 szylingów = 12/100=1200 pensów
zainwestowane pieniądze: 80 1200
zarobek: 22 x
80/22= 1200/x
x = 330 pensów = 27 szylingów i 6 pensów