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3. Write down an expression, evaluate the constant of proportionality, and answer the question.

[Remember to work in SI units. Simplify answers to 1 d.p. only.]

(a) The annual cost (C) of running a business is partly constant and partly proportional to the number of employees.

If there are 20 employees, the annual cost is $400000.

If there are 25 employees, the annual cost is $470000.

Find the annual cost if there are 18 employees

What is meant by partly constant? how would this be written.

C = kN? or C = kN + c?

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# Modelling question

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