The following excel screenshot presents calculating the average profit $($from $20$ replications$)$ of a supplier. Thie monthly demand follows a normal distribution with mean $50$ and standard deviation $5.$ The order quantify of any month is equal to the demand quantity from the previous month.

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What is the amount for 'Cost of Unsatisfied Demand' in Month $4($i$.$e$.,$ the value in cell E$7,$ indicated by the red box$)?$