Use probability of spoilage in yield management to calcule the following problem: Bulldog Airlines Is using a $300$ seat $747$ for this example

Bulldog Airlines is willing to discount tickets $40\%$ if probability of not filling all seats is $>60\%.$

Suppose that the estimated number of seats that will fill is $180$ with a standard deviation of $15$ and $\backslash$phi $\mathrm{.}700$

Each ticket at full price is $$150\mathrm{.}00$

How many seats should be retained at full price?