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2,20 $ c/plato
$$?? c/vaso
12,5 x 0,60 = 7,50
18 x 2,20 = 39,6 7,50 + 39, 6 = 47,10
65,40 - 47,10 = 18,3
18,3 / 15 vasos = 1,22
el Valor de cada vaso es 1,22