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A commodity has a demand function modeled by p = 280 − 0.4x, and a total...

A commodity has a demand function modeled by p = 280 − 0.4x, and a total cost function modeled by C = 80x + 120, where x is the number of units.

(a) What price yields a maximum profit?

(b) Find the average cost per unit when x = 50 and x = 650.

(c) Determine when the demand is elastic, inelastic, and of unit elasticity.

(d) Use differentials to approximate the change in revenue as sales increase from 210 units to 220 units. Compare this with the actual change in revenue.

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Answer #1

a Reunme function By R (u) = 2oon - .4u² By differential AR(n) = flu) su AR(u) = (por. Bu) Du when u=210, Du=220-210210 IDR(u

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