The group has collected 12000lb of cans,for which they could curently recive $7,50per hundred pounds.Thre group can continue to collect cans at the rate of 400lb per day.The recycling company announce that it will lower the price,starting immediately ,by $0,15 per hundred pounds per day .The scouts can make only one trip to the recycling center.Find the best time for trip.What total income will be recived?