Question 397759
a) R(p) = p(2000 - 100p), because revenue = (unit price)*(total number of sales).


b)  R(5) = 5*(2000 - 500) =5*1500 = 7,500 $.
R(10) = 10*(2000 - 1000) = 10*1000 = 10,000 $
R(20) = 20(2000 - 2000) = 0$  (This means that if he charges a unit price of $20, the vendor won't sell anything.)