3.33/5 Coronado Company started operations on January 1, 2015, and has used the FIFO method of inventory valuation since its inception. In 2021, it decides to switch to the average-cost method. You are provided with the following information. Net Income Under FIFO Under Average-Cost Retained Earnings (Ending Balance) Under FIFO 2015 $109,100 $99,300 $103,400 2016 65,800 60,400 146,000 2017 84,300 75,000 240,300 2018 118,400 127,400 353,700 2019 300,300 289,800 645,300 2020 308,600 313,500 728,000 (a) What is the beginning retained earnings balance at January 1, 2017, if Coronado prepares comparative financial statements starting in 2017? Retained earnings, January 1 $ 130800 (b) What is the beginning retained earnings balance at January 1, 2020, if Coronado prepares comparative financial statements starting in 2020? Retained earnings, January 1 S 611200 (c) What is the beginning retained earnings balance at January 1, 2021. if Coronado prepares single-period financial statements for 2021? Retained earnines January 1. 698800