A company purchased merchandise on credit at December 31, 2020, for $15,600. That merchandise was in its warehouse that same day. This purchase was not recorded in 2020 because the accounting department did not receive the invoice from the vendor. In 2021, the invoice was received, reported, and paid. a. Assuming that financial statements are not yet issued for 2020 when this error is discovered, what journal entry, if any, is recorded? The company applies a periodic inventory system. b. Assuming that financial statements are already issued for 2020 when this error is discovered, what journal entry, if any, is recorded? Ignore income taxes. Date Account Name Dr. Cr. a. Dec. 31, 2020 0 0 Date Account Name - Dr. cr. b. Jan. 1, 2021 0 0