You have given the following demand function

Q $=250-100$P $+0\mathrm{.}0001$Pop $+0\mathrm{.}003$I $+0\mathrm{.}003$A

P$=$ Price

Pop$=$ Population

I$=$ Income

A$=$Advertisement

Interpret the demand function

If Pop $=4,000,000$ persons, I $=$ Rs $50,000$ and A $=$ Rs $400,000$

Calculate Q at Price $3,4$ and $5$

Calculate the prices necessary to sell $1,250,1,500,$ and $1,750$