Current Attempt in Progress Marin 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 Under FIFO 2015 $99,300 $88,400 $103,800 2016 76,300 71,500 165,800 2017 90,100 81,000 231,900 2018 110,300 121,100 317,600 2019 317,500 308.200 613,000 2020 283,200 288,000 721,400 (a) What is the beginning retained earnings balance at January 1, 2017, if Marin prepares comparative financial statements starting in 2017? Retained earnings, January 1 S