The answer is E
The question can be simplified as -What is NOT AT ALL IMPORTANT or LEAST IMPORTANT decision for Tanco when switching from NaCl (salt) to KCl (potassium chloride) ?
Lets analyse the options
A. What difference, if any, is there between the cost of the common salt needed to preserve a given quantity of animal hides and the cost of the potassium chloride needed to preserve the same quantity of hides?
Important:-What if cost of salt used by taco annually is only 1$ and Tanco annual profit
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