Please answer the following question by reasoning step-by-step.
Van Helsing gets paid by the town to remove all the vampires and werewolves. He gets $5 per vampire and $10 per werewolf. He removes half the vampires and removes 8 werewolves, and earned $105. There were 4 times as many werewolves as vampires. What percentage of the werewolves did he remove?

20
He earns $80 from werewolf removal because 8 x 10 = 80.

He earned $25 from vampire removal because 105 - 80 = 25.

He removed 5 vampires from town because 25 / 5 = 5.

There were 10 vampires because 5 /.

5 = 10.

There were 40 werewolves because 4 x 10 = 40.

The proportion of werewolves that he removed was.

2 because 8 / 40 =.

2.

The percentage of werewolves removed was 20% because 100 x.

2 = 20.

.

The final answer: 20