You are a seller. You can sell at most three Robot Dogs. The cost of your first dog is $3.50 and you sold it at $6. The cost of your second dog is $5.50 but you did not sell it. The cost of your third dog is $7.50 but you did not sell it. In your market there were a total of 10 Robot Dog transactions. Note that the nuisance cost (damage) to each community member from a single Robot Dog transaction is $0.20. What is your profit at the end of the round?