The demand function is described by the equation q(p)= 30

Question

The demand function is described by the equation q(p)= 30 - p/3.The inverse demand function is described by the equation
A)q(p)= 30 - 3p.
B)p(q)= 90 - 3q.
C)q(p)= 1/(30 - p/3).
D)p(q)= 1/30 - q/3.
E)p(q)= 30 - q/3.

Quizplus · Accepted Answer

The inverse demand function is found by solving the demand function for p in terms of q. Given the original demand function q(p) = 30 - p/3, solving for p gives p(q) = 90 - 3q, which matches option B.