I've always had a problem with word problems...

1)A baseball team is trying to determine what price to charge for tickets. At a price of $10 per ticket, it averages 45,000 people per game. For every increase of $1, it loses 5,000 people. Everyone person at the game spends an average of $5 on concessions. What price per ticket should be charged in order to maximize revenue?

2) The volume of a rectangular box with a square base remains constant at 400 cm^3 as the area of the base increases as a rate of 15cm^3/sec. Find the rate at which the height of the box is decreasing when each side of the base is 19 cm long. (don't round answer)