The Demand Function for a Product Is $p = 140 - 4 x$

Multiple Choice

The demand function for a product is $p = 140 - 4 x$ , where p is the number of dollars and x is the number of units. If the equilibrium price is $\$ 40$ , what is the consumer's surplus?

A) $ $1175$
B) $ $1250$
C) $ $1375$
D) $ $1220$
E) $ $1340$