Question: A rectangular box with an open top has a volume of 5m 3 .The length of the base is thrice the width.Material for the base

A rectangular box with an open top has a volume of 5m^{3 .The length of the base is thrice the width.Material for the base costs ksh.4 per square metre while material for the sides cost ksh.2 per square metre .Express the cost of the material of the box as a function of the width of the base.}

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