He cuts his grass 4-2=<<4-2=2>>2 inches

So he gets it cut every 2/.5=<<2/.5=4>>4 months

That means he gets it cut 12/4=<<12/4=3>>3 times a year

So he pays 100*3=$<<100*3=300>>300 per year

# Answer

300
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
John cuts his grass to 2 inches.  It grows .5 inches per month.  When it gets to 4 inches he cuts it back down to 2 inches.  It cost $100 to get his grass cut.  How much does he pay per year?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
300
John cuts his grass to 2 inches.  It grows .5 inches per month.  When it gets to 4 inches he cuts it back down to 2 inches.  It cost $100 to get his grass cut.  How much does he pay per year?
train