The following units of a particular item were available for sale during the calendar year:
Jan. 1.............. Inventory .............. 10,000 units at $75.00
Mar. 18 ........... Sale ................................. 8,000 units
May 2 ............ Purchase ...............18,000 units at $77.50
Aug. 9 ............ Sale ................................ 15,000 units
Oct. 20 .......... Purchase ................ 7,000 units at $80.25
The firm uses the weighted average cost method with a perpetual inventory system. Determine the cost of goods sold for each sale and the inventory balance after each sale. Present the data in the form illustrated in Exhibit 5?
Exhibit 5: Present Value of $1 at Compound Interest

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13% 0.96154 0.956940 0.95238 0.94787 0.94340 0.93897 0.93458 0.90909 0.90090 089286 0.88496 0.92456 0.915730 0.90703 0.89845 0.89000 0.88166 0.87344 0.82645 0.81162 0.79719 0.78315 0.88900 0.876300 0.86384 085161 0.83962 082785 081630 0.75131 0.73119 0.71178 0.69305 4 0.85480 0.838560 0.82270 080722 0.79209 0.77732 0.76290 0.68301 0.65873 0.63552 061332 5 0.82193 0.802450 0.78353 0.76513 0.74726 a72988 0.71299 0.62092 059345 055743 0.54276 6 0.79031 0.767900 0.74622 0.72525 0.70496 0.68533 0.66634 0.56447 0.53464 0.50663 0.48032 7 0.75992 0.734830 0.71068 0.68744 0.66506 0.64351 0.62275 0.51316 0.48166 0.45235 0.42506 8 0.73069 0.703190 0.67684 0.65160 0.62741 0.60423 0.58201 046651 043393 040388 0.37616 9 0.70259 0.672900 0.64461 0.61763 0.59190 0.56735 0.54393 042410 0.39092 0.36061 0.33288 10 0.67556 0.643930 0.61391 0.58543 0.55839 0.53273 0.50835 0.38554 035218 0.32197 0.29459 Periods 4% 5% 6% 7% 10% 11% 12% 2 2 2