Data Sufficiency (DS) | How many people are employed at a certain manufacturing plant with an

I usually see some DS questions like this where DEFINITE NUMBERs/ VALUEs are asked ,but only ratios/ percentage references are given in the questions as well as in the options.(like in this question the number of employees is asked but there is no reference of NUMBER OF EMPLOYEES anywhere). I usually assume, it cannot be solved with given information and select answer as E. Is there anything wrong with my assumption?

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