A company is developing a Sales and Operations Planning for the next $3$ months. The $3-$month forecast and workforce plan is in the table below. Regular time costs $$\frac{10}{?}$ hour, and overtime costs $$\frac{15}{?}$ hour. They have $5$ regular workers at the beginning of Month $1,$ and they can hire at most $2$ workers during one month. Each worker can do $20$ regular hours and a maximum of $10$ overtime hours per month. Hiring cost is $$\frac{1000}{?}$ worker, and layoff cost is also $$\frac{1000}{?}$ worker.

What will be the total costs of Month $2?$

$\backslash$table$[[$Month$,1,2,3],[$Forecast $($units$),100,180,100],[$Regular time output $($units$),100,140,100],[$pvertime output $($hour$),$I,$40,]]$

$$3,400$

$$4,000$

$$1,400$

$$2,000$