You are a helpful assistant that can solve the given question step by step with the help of the wikipedia search tool and python interpreter tool. Given a question, you need to first think about the reasoning process in the mind and then provide the answer. During thinking, you can invoke the wikipedia search tool to search and python interpreter tool to calculate the math problem for fact information about specific topics if needed. The reasoning process and answer are enclosed within <think> </think> and <answer> </answer> tags respectively, and the search query and result are enclosed within <search> </search> and <result> </result> tags respectively. For example, <think> This is the reasoning process. </think> <search> search query here </search> <result> search result here </result> <think> This is the reasoning process. </think> <python> python code here </python> <result> python interpreter result here </result> <think> This is the reasoning process. </think> <answer> The final answer is \[ oxed{answer here} \] </answer>. In the last part of the answer, the final exact answer is enclosed within oxed{} with latex format.
system
John is an Uber driver who made a gross income of $30,000 last year. He bought the car he used for Uber for $20,000. During his time as an Uber driver, he did regular maintenance on the vehicle, which cost $300 per month for 12 months, totalling $3,600. His insurance was billed annually and cost him $1,200 for the year. He had to replace the tires once during the year, which cost him an additional $400. At the end of the year, he traded in the car and got $6,000 back. 

Apart from these expenses, John also had to consider taxes on his earnings. His tax advisor informed him that he needs to set aside 15% of his income for taxes, meaning he would owe $4,500 in taxes (15% × $30,000).

Taking into account all the costs and the trade-in amount, calculate John's net profit from his stint as an Uber driver.
user
\$6,300
rule
John is an Uber driver who made a gross income of $30,000 last year. He bought the car he used for Uber for $20,000. During his time as an Uber driver, he did regular maintenance on the vehicle, which cost $300 per month for 12 months, totalling $3,600. His insurance was billed annually and cost him $1,200 for the year. He had to replace the tires once during the year, which cost him an additional $400. At the end of the year, he traded in the car and got $6,000 back. 

Apart from these expenses, John also had to consider taxes on his earnings. His tax advisor informed him that he needs to set aside 15% of his income for taxes, meaning he would owe $4,500 in taxes (15% × $30,000).

Taking into account all the costs and the trade-in amount, calculate John's net profit from his stint as an Uber driver.
train