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Martinez 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 Net Income (Ending Balance) Under FIFO Under Average-Cost Under FIFO $102,300 $93.000 $91,800 2015 2016 66,400 61.600 151,300 2017 91,200 81.500 249,800 2018 124,100 133,700 310,300 2019 319,700 310,000 536,700 2020 312,600 317.900 757.900 (a) What is the beginning retained earnings balance at January 1, 2017, if Martinez prepares comparative financial statements starting in 2017? Retained earnings, January 1 $ 137200 (b) What is the beginning retained earnings balance at January 1, 2020. if Martinez prepares comparative financial statements starting in 20207 Retained earnings, January 1 $ 512800 (a) What is the beginning retained earnings balance at January 1, 2017. 11 Martinez prepares comparative financial statements starting in 20177 Retained earnings January 1 $ 137200 (b) What is the beginning retained earnings balance at January 1, 2020. | Martinez prepares comparative financial statements starting in 2020? Retained earnings, January 1 512800 (c) What is the beginning retained earnings balance at January 1, 2021, Martinez prepares single-period financial statements for 2021? Retained earnings, January 1 238200 (d) What is the net income reported by Martinez in the 2020 income statement it it prepares comparative financial statements starting with 2018? 2018 2019 2020 Net Income $ 133700 $ -9700