"Differentiation is not something hatched in marketing and advertising department ,nor it is limited to the catchalls to quality and service".Justify your answer.​

In mathematics, the derivative of a function of a real variable measures the sensitivity to change of the function value with respect to a change in its argument. Derivatives are a fundamental tool of calculus.

c

Explanation:

Payback calculates the amount of time it takes to recover the amount invested in a project from it cumulative cash flows

Payback period = Amount invested / cash flow

Cash flow = profit after tax + depreciation

Straight line depreciation expense = (Cost of asset - Salvage value) / useful life

(300,000 - 0) / 5 = $60,000

Profit after tax = (1 - tax rate) x (sales - expenses - depreciation)

0.6 x ($200,000 - $80,000 - $60,000) = $36,000

Cash flow = $36,000 + 60,000 = 96,000

Payback period = $300,000 / $96,000 = 3.1 years