the following info was available from the inventory records of rich company for January balance at January 1. 9000. 9.77. 87930 purchases Jan 6. 6000. 10.30 61800 Jan 26. 8100 10.71. 86751 sales Jan 7. 7500 Jan 31. 11100 balance at Jan 31. 4500 assuming that rich does not maintain perpetual inventory records what should be the inventory at January 31 using the weighted average inventory method rounded to the nearest dollar