Whispering 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. 2015 2016 2017 2018 2019 2020 Net Income Under FIFO Under Average-Cost $95,100 $85,600 65,400 60,500 98,200 89,000 116,400 125,600 279,800 269,000 334,700 339,800 Retained Earnings (Ending Balance) Under FIFO $101,700 144,400 223,500 342,200 551,600 781,600 (a) What is the beginning retained earnings balance at January 1, 2017, if Whispering prepares comparative financial statements starting in 2017? Retained earnings, January 1 $ (b) What is the beginning retained earnings balance at January 1, 2020, if Whispering prepares comparative financial statements starting in 2020? Retained earnings, January 1 $ (c) What is the beginning retained earnings balance at January 1, 2021, if Whispering prepares single-period financial statements for 2021? Retained earnings, January 1 $ (d) What is the net income reported by Whispering in the 2020 income statement if it prepares comparative financial statements starting with 2018? 2018 2019 2020 Net Income $ $ $ $