Actually calculate the new price and quantity

D. Suppose the price of replacement screens (a necessary part to do a repair) increases by $20. What will the new Supply curve be? Why?

E. Will the new equilibrium quantity be 90, more than 90, or less than 90? Sketch a graph of a Demand curve and two Supply curves showing why. (The curves don't have to exactly match the equations given; you just need to demonstrate the idea.)