Suppose that Tata's consultant estimated the following regression equation for Indica

automobiles:

QI = 100,000 - 100PI + 2,000N + 50I + 30PM - 1,000PP + 3A + 40,000 Pi

Where

QI = quantity demanded per year of Indica automobiles

PI = price of Indica automobiles, in dollars

N = Population of India, in millions

I = Per capita disposable income, in dollars

PM=Price of Maruti automobiles, in dollars

PP =Real price of petrol, in cents per gallon

A = advertising expenditures by Indica, in dollars per year

Pi = credit incentives to purchase Indicas, in percentage points below the rateof interest on borrowing in the absence of incentive

a) Indicate the change in number of Indicas purchased per year (QI) for each unitchange in the independent or explanatory variables.

b) Find the value of QI if the average value of PI = $9000, N = 200 million, I =$10000, PM= $8000 ,PP = 80 cents, and A = $200000, and if Pi =1

c) Derive the equation for the demand curve for indicas

d) Plot