AB Ltd.'s gross sales was $10,400, net sales account for an average 10% discount on all items sold and 5% of items were returned during the year. Also during the year the cost of goods sold was $9,611 Required 1: If beginning and ending inventory are zero (Just in time), AB's net purchases for the period must have been: $ Required 2: AB's Sales Returns and Allowances for the period must have been. $[ Required 3: AB's Sales Discounts for the period must have been $[ Required 4. AB's Net Sales for the period must have been: $[ Required 5: AB's Gross Profit on Sales in dollars for the period must have been (in case of negative, then use (minus sign) before the number): $