The Lady with the Plan needs to make campaign T-shirt to fund raise.  She is trying to decide how many to make for the coming political campaign.  During the campaign itself, which lasts one month, a T-shirt sells for $20.  Though, when the campaign ends, any unsold T-shirts are sold for $4 apiece.  It costs $8 to make a campaign T-shirt.  The Lady's calculates of the season's demand of T-shirts is as follows:

Demand Probability    
300        0.05
400        0.10
500        0.40
600        0.30
700        0.10
800        0.05

How many T-shirts should the lady stock for the upcoming campaign?