The units of an item available for sale during the year were as follows Jan 1. Inventory 42 units at $180 Apr. 10 purchase 58 units at $195 Sept 30 purchase 20 units at $204 Dec 12 purchase 30 units at $210 There are 37 units of the item in the physical inventory as December 31. The periodic inventory system is used. Determine the inventory cost and the cost of merchandise sold by three methods, presenting your answers in the following form:

Merchandise inventory Merchandise sold

a. First-in, first-out $ $

b. Last-in, first-out

c. Average cost