He has 75 green caps because 125 - 50 = <<125-50=75>>75

The proportion of caps that are green is .6 because 75 / 125 = <<75/125=.6>>.6

The percentage that are green is 60 because .6 x 100% = <<60=60>>60%

# Answer

60
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Ali is collecting bottle caps. He has 125 bottle caps. He has red ones and green ones. If he has 50 red caps, what percentage of caps are green?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
60
Ali is collecting bottle caps. He has 125 bottle caps. He has red ones and green ones. If he has 50 red caps, what percentage of caps are green?
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