a company had a beginning inventory of $180$ units that cost $$117,000$ in May $1,$ in May $5$ they sold $120$ units for $$101,400,$ in May $9$ they purchased $60$ more units for $$42,900,$ in May $13$ they again purchased $240$ more units for $$187,200,$ in May $24$ they sold $240$ units for $$218,400,$ In may $27$ sold $60$ more units for $$62,400,$ then in May $30$ they purchased $90$ more units for $$77,220,$ using this information calculatre the company's Cost of Goods Sold, Gross Margin, and Ending Inventory using weighted average