The accounting records of Bryn Enterprises show the following data:

Beginning Inventory - 1,000 pieces at $20/piece

Purchases - 7,000 pieces at $25/piece

Sales - 6,000 pieces at $45/piece

Determine the cost of goods sold during the period under a periodic inventory system using (a) the F I F O method, (b) the L I F O method, and (c) the average-cost method.