The president of Hill Enterprises, Terri Hill, projects the firm's aggregate demand requirements over the next $8$ months as follows:

$$80$ per unit. Evaluate this plan. $($Enter all responses as whole numbers.$)$

Note: Both hiring and layoff costs are incurred in the month of the change. For example, going from $1,600$ in January to $1,500$ in February incurs a cost of layoff for $100$ units in February.

The total cost of hirings $=$$$.($Enter your response as a whole number.$)$

The total cost of layoffs $=$$$,($Enter your response as a whole number.$)$

The total inventory carrying cost $=$$ $($Enter your response as a whole number.$)$

The total stockout cost $=.($Enter your response as a whole number.$)$

The total cost, excluding normal time labor costs, is $=9($Enter your response as a whole number.$)$