Elephantiasis is a symptom of a variety of diseases, where parts of a person's body swell to massive proportions. Elephantiasis tropica or lymphatic filariasis, caused by a number of parasitic worms, particularly Wuchereria bancrofti. More than 120 million people, mostly in Africa and Southeast Asia, are affected.
The relevant range of operations is the normal or average scope of business activities. In the other words, the relevant range of operations is the average volume of sales and production that a business experiences outside of extreme economic prosperity and depression.
Relevant cost for making the product are all the costs that could be avoided by not making the product as well as the opportunity cost incurred by using the production facilities to make the product as opposed to the next best alternative usage of the production facilities.