david kalb started a pet-walking business , he charges $20 to walk one dog, twice a day. He walks six dogs five days a week for four customers. He walks three dogs seven days a week for three other customers. How much money does David get from his customers each week? If his weekly expenses are $350, what is the profit?

6 dogs $20 each is $120 per day. $120 per day times 5 is $600. 3 dogs $20 each is $60 per day. $60 per day times 7 is $420. $600+ $420 is $1020 per week. $1020 - $350 is $670 profit per week after expenses.