Dilbert’s Department Store is trying to determine how many Hanson T-shirts to order. Currently the shirts are sold for $21.00, but at later dates the shirts will be offered at a 10% discount, then a 20% discount, then a 40% discount, then a 50% discount, and finally a 60%

discount. Demand at the full price of $21.00 is believed to be normally distributed with mean 1800 and standard deviation