Q63 National Detergent Co had the following transactions for a period for a particular line of Inventory for the month of January 5th Jan Purchased 60 tonnes @ $20 per tonne 15th Jan Purchased another 30 tonnes at $22 per tonne 25th Jan Sold 30 tonnes The business uses AVCO as its way of dealing with inventory flow assumptions. The value of closing stock at the for the month of January is: $660,00 $1.240.20 $1.260.00 $620.00