E 20-19 Error correction; inventory error During 2024, Lipe and Lipe Corporation discovered that its ending inventories reported on its financial statements were misstated by the following amounts: Lipe and Lipe uses the periodic inventory system and the FIFO cost method. Required: 1. Determine the effect of these errors on retained earnings at January 1,2024 , before any adjustments. (Ignore income taxes.) 2. Prepare a journal entry to correct the error in 2024. 3. Will Lipe and Lipe account for the error (a) retrospectively or (b) prospectively