In BCC structure, the space occupied is about, (a)68% (b) 53% (c) 38% (d) 32%
Please explain how

Packing efficiency is the percentage of total space occupied by constituent particles (atoms, molecules or ions) in a unit cell.

Packing efficiency in CCP is 74% while in BCC structures is 68%

Kindly refer to the following link :
https://www.meritnation.com/cbse/class12-science/ncert-solutions/chemistry/chemistry-part-i/the-solid-state/page31-exercise-qno1.10/17_260_5942/calculatethe-efficiency-of-packing-in-case-of-a-metal