You work for a small retail store. You must decide how many cases of kombucha to order. Twenty cases fit on a pallet and because of shipping costs, orders must be placed in multiples of $20.$ You can either order $20,40,60,80$ or $100$ cases. Each case costs $$15.$ If you order more than $1$ pallet, you receive a discount of $5\%$ per additional pallet ordered $(2$ pallets would be $5\%,3$ would be $10\%,$ etc$).$ The cases can be sold for $$25$ each. Any that are left unsold can be sold to a discount store for $$10.$ Your records suggest that the probability that you will sell $25$ cases is $20\%,45$ cases is $45\%,65$ cases is $20\%$ and $85$ cases is $15\%$