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Number of items manufactured by the company=t

Number of employees hired by the company=n

As the number of items is directly proportional to number of employees, this means that as the number of items increases the number of employees also need to be increased and vice versa.

t is directly proportional to n

t=kn (where k is proportionality constant)

k is a constant to satisfy the directly proportional relation

Please let me know if you need any clarification. I'm always happy to answer your questions.