Please answer the question attached in the picture. Provide explanation or calculation work of the answer. Please and Thank you.

AB Ltd.s gross purchases were $18,200, net purchases account for an average 10% discount on all items purchased and 5% of items were returned due to wrong specifications during the year. Also during the year the net sales were $16,832 Required 1: If beginning and ending inventory are zero (Just in time), AB's cost of good solf for the period must have been: $ Required 2: AB's Purchase Return and Allowances for the period must have been: $ Required 3: AB's Purchase Discounts for the period must have been: $ Required 4: AB's Net Puchases for the period must have been: $ Required 5: AB's Gross Profit on Sales in dollars for the period must have been: $