Priya, a small business owner who sells only one product, started March with no inventory. Over the course of the month, she made the following purchases: Date March 1 March 10 March 18 March 25 March 30 Number of units purchased 10 5 8 10 3 Total cost of order $920 $480 $760 $930 $300 Here is Priya's sales data: Date March 4 March 7 March 8 March 11 March 16 March 20 March 24 March 27 March 31 Number of units sold 2 4 1 3 2 5 4 6 Total sales value $300 $520 $170 $440 $290 $600 $510 $620 $520 4 a) Assuming Priya uses the first-in-first-out inventory costing method, what is her gross margin? b) Assuming Priya uses the moving-weighted average Inventory costing method, what is the value of her ending inventory