Packing efficiency of a given unit cell or metal

This type of question, asked 2 times: May 2022 S1, 9 May 2024 S1. All 2 questions below, oldest first.

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Question 1
May 2022 S1
61 $What is the total volume occupied by atoms in bcc unit cell?$
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Question 2
9 May 2024 S1
53 $What is the packing efficiency of silver metal in its unit cell?$
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