The external dimension of a hollow metal cuboid is 35 cm × 28 cm × 16 cm. If the thickness of the metal is 1.5 cm at each side and the weight of the metal per m3 is 5400 kg/m3. The weight of the metal contained in the block is ________ kg.
1
25.12
2
28.51
3
31.01
4
35.75
5
None of the above