A cubical block of side 0.5 m floats on water with $30\%$ of its volume under water. What is the maximum weight that can be put on the block without fully submerging it under water?\\
[Take, density of water $= 10 ^ { 3 } \mathrm {~kg} / \mathrm { m } ^ { 3 }$ ]\\
(1) 87.5 kg\\
(2) 65.4 kg\\
(3) 30.1 kg\\
(4) 46.3 kg