Wholesale company produces circuit breaker containers. The machine operator stamps 15 containers from each strip of aluminum. Each strip costs $1.15. The operator can stamp 540 containers per hour. The direct labor charge is $17.85 per hour. What is the prime cost of manufacturing a circuit breaker container?
a.$.32 b.$.03 c.$.13 d.$.11 e.not given

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Solution. Since the operator can stamp 540 containers per hour, ...

Hello,
I need help with proving the following statement:
"A prime p is said to be a Sophie Germain prime if n = 2p+1 is also prime.
Prove that a prime p is a Sophie Germain prime if and only if 2^(n-1) = 1 (mod n)."
Thank you for your time.

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