If the supply curve for snowboards in the United States is described by the equation Q S = 400P – 8,000 (where Q is the number of snowboards and P is in dollars per snowboard), compute the producer...

If the supply curve for snowboards in the United States is described by the equation Q S =

400P – 8,000 (where Q is the number of snowboards and P is in dollars per snowboard), compute

the producer surplus at a price of $120. What happens to producer surplus if the price falls to $100?