Single dog is $20 + (10 minutes * $1 per minute) = $<<20+10*1=30>>30.

Two dogs are 2 * ($20 + (7 minutes * $1 per minute)) = $<<2*(20+7*1)=54>>54

Three dogs are 3 * ($20 + (9 minutes * $1 per minute)) = $<<3*(20+9*1)=87>>87

The total is $30 + $54 + $87 = $<<30+54+87=171>>171.

# Answer

171
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Greg has his own dog walking business. He charges $20 per dog plus $1 per minute per dog for walking the dog. If he walks one dog for 10 minutes, two dogs for 7 minutes and three dogs for 9 minutes, how much money, in dollars, does he earn?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
171
Greg has his own dog walking business. He charges $20 per dog plus $1 per minute per dog for walking the dog. If he walks one dog for 10 minutes, two dogs for 7 minutes and three dogs for 9 minutes, how much money, in dollars, does he earn?
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