The diagram shows a thin square sheet of metal measuring 24 cm by 24 cm. A square of side x cm is cut off from each corner. The remainder is then folded to form an open box, x cm deep, whose square base isshown shaded in the diagram. (i) Write the volume, Vcm³, of the box as = 4x³-96² +576x (ii) Compute the maximum cost paid to fill up the box with sand if RM 0.30 per cubic centimeter of sand changed​