Company use perpetual average price system. On January 10, a unit bought 600 items for $ 5 / item. Then on January 20, it bought 400 items for $ 10 / item. On January 30, the unit released 500 items. What was the cost of issue if the unit had a stock of 100 items at $ 15 / item as of January 1.

Select one:

3863,64

3500

4500

500