Carla 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 Retained Earnings (Ending Balance) Net Income Under FIFO Under Average-Cost 2015 $92,900 $82,500 $93,000 61,000 155,900 84,900 229,000 66,100 94,000 119,900 296,700 294,400 129,900 350,700 539,200 285,700 298,900 2020 717,200 (a) What is the beginning retained earnings balance at January 1, 2017, if Carla prepares comparative financial statements starting in 2017? Retained earnings, January 1 $ (b) What is the beginning retained earnings balance at January 1, 2020, if Carla prepares comparative financial statements starting in 2020? Retained earnings, January 1 $ (b) What is the beginning retained earnings balance at January 1, 2020. if Carla prepares comparative financial statements starting in 2020? Retained earnings, January 1 $ (c) What is the beginning retained earnings balance at January 1, 2021, if Carla prepares single period financial statements for 2021? Retained earnings, January 1 $ (d) What is the net income reported by Carla in the 2020 income statement if it prepares comparative financial statements starting with 2018? 2018 2019 2020 Net Income $