He cuts off 9-6=<<9-6=3>>3 inches when he gets a haircut
That means he needs to cut it every 3/1.5=<<3/1.5=2>>2 months
So he gets 12/2=<<12/2=6>>6 haircuts a year
He gives a 45*.2=$<<45*.2=9>>9 tip
So that means each hair cut cost 45+9=$<<45+9=54>>54
So he pays 54*6=$<<54*6=324>>324 a year
#### 324