Answer:
The duties under the teaching contract cannot be delegated
Explanation:
The person wit whom the school has a binding agreement was Teresa and contract of services cannot be delegated unilaterally by Teresa to her friend Shirley without consulting the school authority.
The appropriate procedure would be for Teresa to discuss with the school her plans to let Teresa to cover up for her absence,however, if the school accepts the new arrangement , Teresa would need to be relieved of her duties as this would be a permanent substitution.
A drop in interest will result in lower payments because of its overall discretion value
The currency would deflate, though this never happens
Answer: Degree of Operating Leverage
A Tech = 2.75
Z Tech = 3
Explanation:
As defined in question itself,
Degree of Operating Leverage = 
As here, it is provided that profit for both the companies are same amounting $4 million.
Although the fixed cost differ by $1 million.
A Tech Degree of operating Leverage = 1 +
= 2.75
Z Tech Degree of Operating Leverage = 1 +
= 3
This clearly demonstrates that A Tech will reach its break even faster than the Z Tech as the ratio of fixed cost to variable cost is lower in A tech in comparison to Z Tech.