Problem 6-5. Electronic Heaven, Inc., sells electronic merchandise, including a personal computer offered for the first time in September, which retails for $695. Sales of this personal com- puter for the next six-month period (ending February 28) totaled $52,125. Purchase records indicate the following on the amounts purchased and prices paid by Electronic Heaven: Purchase Date Units Cost per Unit $370 September 10 October 15 November 2 December 10 February 3 Required 12 20 32 2222 11 10 375 360 350 335 a. Prepare a statement for this personal computer showing its gross margin for the six- month period ending February 28 using the FIFO, average cost, and LIFO inventory methods. b. What was the gross margin percentage earned on the $52,125 sales of this personal computer? (Hint: The answer depends on the inventory method used.) c. If all of the purchases and sales of this personal computer were for cash, what was the net pretax cash flow resulting from the purchases and sales of this personal com- puter? Would the use of different inventory methods change the pre-tax cash flow figure you calculated? d. Assume a tax rate of 30 percent. What would be the net after-tax cash flow using different inventory methods for tax purposes?