The following units of an item were available for sale during the year

Jan 1. Inventory 30 units @ $130

Mar 10. Purchase 70 units @ $140

Aug. 15. Purchased 10 units @ $145

Dec 10. Purchased 70 units @$150

There are 80 units of the item remaining in the physical inventory on December 31st. The periodic inventory system was used. Determine the inventory cost and cost of merchandise sold using the three main methods