Dino does some online gig work for a living.  He works 20 hours a month making $10 an hour.  He works 30 hours a month making $20 an hour.  He works 5 hours a month making $40 an hour.  He pays $500 a month in expenses.  How much money does Dino have left at the end of the month?
Please reason step by step, and put your final answer within \boxed{}.
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