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el m de tela cuesta: $2
144 m tiene 12 docenas de m
1 docena cuesta 12 * 2 = 24
12 docenas cuestan 12 * 24 = $ 288
12 docenas se venden a 12 * $80 = $960
ganancia: 960 - 288 = $672
RTA. Se ganó $672
saludos