Sindy sells a specialty portable winch that is popular with many of the local customers for use at their lake homes (putting docks in and out, launching boats, and so on). The Sindy winch is a standard-manufacture winch that Sindy modifies so that the winch can be used for a variety of tasks. Sindy sold 70 of these winches during 2020 at a total price of $21,000, with a warranty guarantee that the product was free of any defects. The cost of winches sold is $16,000. The assurance warranties extend for a three-year period with an estimated cost of $2,100. In addition, Sindy sold extended warranties (service warranties) related to 29 Sindy winches for two years beyond the three-year period for $400 each. In the year of 2021, the total repair expenses for the 70 winches under the warranty is $2,000. Required (ignore the time value of money in your answer) a) Identify the separate performance obligations in the 2020 selling contract, and briefly explain the point in time when the performance obligations are satisfied. b) Prepare the journal entries for Sindy related to the sales of Sindy winches with warranties. c) Prepare the journal entry to record the repair expenses incurred in 2021 under the warranty