The diagram represents a solid frustum with base radius 21cm and top radius 14cm. The frustum is 22.5cm high and is made of a metal whose density is 3 g/cm^{3}.

(Take π=22/7)

- Calculate
- The volume of the metal in the frustum.
- The mass of the frustum in kg.

- The frustum is melted down and recast into a solid cube. In the process 20% of the metal is lost. Calculate to 2 decimal places the length of each side of the cube.