please answer all sections. i am lost.

b. Assuming this Target store orders 250 units, what is the expected on-hand inventory (leftover)? (Please provide step by step details) (5 points) c. Assuming this Target store orders 250 units, what are the expected sales and expected profit? (Please provide step by step details, including all the revenues and COGS) ( 8 points) d. If this target store could maximize its profit, what would be the optimal order quantity? (Please provide step by step details, including costs and critical ratio) ( 8 points)