Suppose the demand & supply for the market for sweet potatoes is given by the following equations: Q_D=200-20 P & Q_S=30+30P where P is the price per lb. of sweet potatoes, Q_D is the quantity...

Suppose the demand & supply for the market for sweet potatoes is given by the following equations: Q_D=200-20 P & Q_S=30+30P where P is the price per lb. of sweet potatoes, Q_D is the quantity demanded for sweet potatoes and Q_S is the quantity supplied.

1.Calculate the consumer surplus at market price $4.00.

2.Calculate the producer surplus at price $4.00.