someone help fill the blanks please

The following information relates to Carla Vista Ltd.'s inventory transactions during the month of July. All of the units sold were priced at $20 per unit. Carla Vista Ltd. uses the perpetual inventory system. Calculate Carla Vista' cost of goods sold, gross margin, and ending inventory for the month of July using weighted-average. (Round calculations for cost per unit to 2 decimal places, eg. 10.52 and final answers to 0 decimal places, eg. 61,052.) Cost of goodssold $ Gross margin Ending inventory