Sandhill 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 Retained Earnings (Ending Balance) Under FIFO Under Average-Cost Under FIFO 2015 $99,900 $90.900 $107,100 2016 72.700 68.100 150,300 2017 95,400 85,600 231,700 2018 127,000 137,800 315,400 2019 302,700 293,200 541,600 2020 307.900 313,300 853,800 (a) What is the beginning retained earnings balance at January 1, 2017, if Sandhill prepares comparative financial statements starting in 2017? (a) What is the beginning retained earnings balance at January 1, 2017, if Sandhill prepares comparative financial statements starting in 2017? Retained earnings, January 1 $ (b) What is the beginning retained earnings balance at January 1, 2020, if Sandhill prepares comparative financial statements starting in 2020? Retained earnings, January 1 $ (c) What is the beginning retained earnings balance at January 1, 2021, if Sandhill prepares single-period financial statements for 2021? Retained earnings. January 1 $ (c) What is the beginning retained earnings balance at January 1, 2021, if Sandhill prepares single-period financial statements for 2021? Retained earnings, January 1 $ (d) What is the net income reported by Sandhill in the 2020 income statement if it prepares comparative financial statements starting with 2018? Net Income $ 2018 2019 2020