The demand equation for good B is given by the following equation QB = 50 - 1.5 PB + 0.004 R where PB is expressed in dollars per kilo, R is expressed in dollars and Q in kilos. Suppose R = S10,000 and PB = $20 1- What is the quantity demanded of good B? 2-Graphically represent the demand curve for good B. The graphic representation must be precise. 3- Take your graph again and represent consumer surplus when PB = $20