please help with the following question:

Company A's transactions for the year ended 31 December 2006 were as follows: Units Unit cost Unit selling price Inventory on hand 1/1/06 60 $75 January - April purchases 90 $60 January -April sales (40) $130 May - August purchases 55 $45 May - August sales (45) $100 September - December purchases 60 $30 September - December sales (75) $60 Total number of units purchased 205 $9,675 Total number of units sold (160) $14,200Calculate cost of sales and closing inventory under the following cost follow assumptions: 1. FIFO 2. Weighted average 3. LIFO