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

Multiple Choice

Suppose demand is given by $\mathrm { Q } ^ { \mathrm { d } } = 400 - 15 \mathrm { P } + \mathrm { I }$ , where $\mathrm { Q } ^ { \mathrm { d } }$ is quantity demanded, $\mathrm { P }$ is price and $\mathrm { I }$ is income. Supply is given by $Q ^ { s } = 5 P$ , where $Q ^ { s }$ is quantity supplied. When $I = 200$ , equilibrium price is

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