answer both a and b please! thanks!

Signal Systems uses a periodic inventory system. On March 31, Signal has two WIFI extenders on hand at a cost of $1,500 each (serial numbers 21534892 and 21534894). In April, the company purchases four more identical WIFI extenders from its supplier for $1,450 each (serial numbers 21542631 through 21542634). In May, the company purchases five more identical WIFI extenders for $1,600 each (serial numbers 21550964 through 21550968). In June, Signal sells two of these WIFI extenders (serial numbers 21534894 and 21542631), There were no additional purchases or sales during the remainder of the year. Signal Systems use the specific identification method. What is its cost of goods sold? O $2,950 $3.000 $3,200 $3,033 Lift Company uses a periodic inventory system and its inventory records contain the following information: Beginning inventory Purchased on May 10 Purchased on June 15 Purchased on August 28 Units 600 800 1.000 600 1,000 Total cost $1,560 2,340 2.520 1.980 $8,400 The company sold 2,000 units during June. There were no additional purchases or sales during the remainder of the year. The company had 1,000 units were in its ending inventory at the end of the year, Lift uses the weighted average inventory costing method, what is the cost of its ending inventory? (Round the per unit cost to 2 decimal places and then round your answer to the nearest whole dollar.) $2.730 $2,800 55.400. O $8,400