Stephen runs a pet salon. He is currently grooming 130130 dogs per week. If instead of grooming 130130 ​dogs, he grooms 131131 ​dogs, he will add ​$65.8265.82 to his costs and ​$68.1268.12 to his revenues. What will be the effect on his profits of grooming 131131 dogs instead of 130130 ​dogs?