0,2a + 0,4b + c = 2,6 1,8a + 2,8b + 6,8c = V Situações possíveis: a =6, b = 1, c = 1 ---> V = 1,8.6 + 2,8.1 + 6,8.1 = R$ 20,40 a = 4, b = 2, c = 1 ---> V = 1,8.4 + 2,8.2 + 6,8.1 = R$ 19,60 a = 2, b = 4, c = 1 ---> V = 1,8.2 + 2,8.4 + 6,8.1 = R$ 21,60 a = 1, b = 1, c = 2 ---> V = 1,8.1 + 2,8.1 + 6,8....