Final answer:
The principal idea summarizing the provided paragraph is embodied in the sentence: 'All in all it was the best year in the history of the company.' This reflects the positive aspects mentioned throughout the text such as low costs, high output, well-placed personnel, and so on.
Step-by-step explanation:
The sentence that best represents the main idea of the paragraph provided is: 'All in all it was the best year in the history of the company.' This statement summarizes the information presented in the other sentences, indicating low costs, high outputs, optimal personnel placement, a firm market, and no losses from fire. Hence, the combination of these factors leads us to believe that it was, in fact, the most successful year in the company's history.
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