Beginning inventory, purchases, and sales for WCs12 are as follows: a. Assuming a perpetual inventory system and using the weighted average method, determine the weighted average unit cost after the october 22 purchase. Round your answer to two decimal places. Der unit b. Assuming a perpetual inventory system and using the weighted average method, determine the cost of goods sold on october 29 . Round your averade unit cost" to two decimal places. c. Assuminia a perpetual inventory system and using the weighted average mathod, determine the inventory on october 31 . Round your "average unit cost't to two decimal places