Question: b. A closed rectangular box is to be built with the volume equal to xyzm3. The material for the bottom of the box cost RM

b. A closed rectangular box is to be built with the volume equal to xyzm3. The material for the bottom of the box cost RM 1 per m2 while the top and sides cost RM 8 per m2. Evaluate the dimensions (x,y and z ) of the box with minimum cost with total volume cost RM 38.[15 marks]

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