Comfy Feet Manufactures Slippers The Company Had Zero Work-In-Process at the End of Both

Comfy Feet manufactures slippers. In 2020, the company hired a new bookkeeper who did not have appropriate training. The bookkeeper charged all of the following costs for manufacturing 70,000 pairs of slippers to "Production Expense."
$$\begin{array} { l | r | } \hline \text { Raw materials } & \$ 34,000 \\\hline \text { Factory labour } & 115,000 \\\hline \text { Variable manufacturing overhead } & 14,000 \\\hline \text { Fixed manufacturing overhead } & 17,000 \\\hline \text { Factory depreciation } & 30,000 \\\hline \text { Finished goods storage } & 1,500 \\\hline \text { Interest for carrying finished goods } & \underline { 1,600 } \\\hline \text { Total } & \$ 213,100 \\\hline\end{array}$$ The company had zero work-in-process at the end of both 2019 and 2020. Finished goods amounted to 20,000 pairs at $9.00 per pair at the end of 2019. There were 6,500 pairs in finished goods inventory at the end of 2020.
Required:
a. Provide the adjusting journal entry or entries at Dec 31, 2020 to correct the bookkeeper's errors and properly record the above expenditures recorded in the "Production Expense" account.
b. Assume the company uses a periodic inventory system and the FIFO cost flow assumption for finished goods. Calculate the cost of goods sold and the ending value of finished goods inventory for the year 2020.
c. Now assume the company uses the weighted-average cost flow assumption. Calculate the cost of goods sold and the ending value of finished goods.