Consider a market characterized by the following inverse demand and supply functions. PX equals to 50 minus 4QdX and PX equals to 10 plus 2QsX where PX is the price of good X, QdX is the quantity demanded for good X and QsX is he quantity supplied for good X. Compute the surplus producers receive when a $30 per unit price floor is imposed on the market.

Select one:

a.$50.

b.$25.

c.$75.

d.$35.

e.none.