Suppose Demand Is Given By $Q ^ { d } = 400 - 15 P + I$

Multiple Choice

Suppose demand is given by $Q ^ { d } = 400 - 15 P + I$ , where $Q ^ { d }$ is quantity demanded, $P$ is price and $I$ is income. Supply is given by $\mathrm { Q } ^ { \mathrm { s } } = 5 \mathrm { P }$ , where $\mathrm { Q } ^ { \mathrm { s } }$ is quantity supplied. When $\mathrm { I } = 100$ , equilibrium price is

A) 15
B) 20
C) 25
D) 30