Topanga Group began operations early in 2018. Inventory purchase information for the quarter ended March 31, 2018, for Topangas only product is provided below. The unit costs include the cost of freight. The company uses a periodic inventory system.

Date of Purchase	Units		Unit Cost			Total Cost
Jan. 7	2,000		$	2.00			$	4,000
Feb. 16	10,000			3.00				30,000
March 22	14,000			4.00				56,000
Totals	26,000							90,000

Sales for the quarter, all at $9 per unit, totaled 16,000 units leaving 10,000 units on hand at the end of the quarter. Required: 1. Calculate Topanga's cost of goods sold for the first quarter using:

1. FIFO
2. LIFO
3. Average cost

2. Calculate Toponga's gross profit ratio for the first quarter using FIFO, LIFO, and Average cost. 3. Comment on the relative effect of each of the three inventory methods on the gross profit ratio.