A company plans to manufacture rectangular boxes with no top that have volume 12 cubic feet. The cost per square foot of the material to be used is $ 3 for the bottom of the box and $1 for the remaining four sides of the box. Let a, b and c be the dimensions of the box that will Minimize the production cost, find a + b + c. Enter your answer without units. Enter an integer or a fully reduced fraction such as -2, 7, -3/4, 41/7 etc. No spaces please

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