5 To generate data for demand estimation oranges are sold in four supermarkets at different prices for one week. Price Number sold Supermarket A ABCD 3579 65 55 45 35 From these observations, estimate demand as a linear function of price. Using this estimated function: (i) Find the total, average and marginal revenue functions. (ii) Graph the functions in question (i), and comment on their interrelation. (iii) Estimate demand when price equals 6. Find the point elasticity of demand at this price. (iv) Measure the arc elasticity of demand between a price of 6 and 8 units. (v) At what price is demand of unit elasticity? Given the form of the experiment, comment on the likely reliability of the demand estimates.