$$PQRS$$ is a cyclic quadrilateral. If $$\angle P$$ is 4 times $$\angle R $$, and $$\angle S $$ is 3 times $$\angle Q$$, then the average of $$\angle Q$$ and $$\angle R $$ is:

A

$$40.5^\circ$$

B

$$45.7^\circ$$

C

$$90^\circ$$

D

$$81^\circ$$