Shoot the Monkey $($Honors$)$

A hunter is on the ground waiting in some bushes to hunt some monkeys. The hunter spots a monkey hanging in a tree that is $40$ m away $($horizontally$)$ and $30$ m high $($vertically$).$ The hunter aims the gun directly at the monkey and shoots. However, the smart monkey lets go of the tree as soon as the bullet is shot. If the bullet is shot out at $90\frac{m}{s},$ by how much does the bullet miss the monkey?