A company wants to develop a level production plan for a family of products. The opening inventory is $100$ units, and then increase to $180$ units is expected by the end of the plan the demand for each of the next $6$ periods is: $100,120,125,130,115$ and $110.$ Assume that all periods at the same number of working days. The cost of production is $$5$ per unit. Based on this data, the total production cost for the company over the next $6$ periods would be:

Group of answer choices

$$3,900$

$$2,500$

$$1,500$

$$1000$

None of the above