solve the following exercise

oBI.3 Beginning inventory, purchases, and sales for 30xT are as follows May 1 12 Inventory Sale Purchase Sale 50 units at $80 35 units 60 units at 590 55 units 26 method, deter inventory system and using the weighted mine (a) the weighted average unit cost after the May 23 purchase, (b) the cost of the merchandise sold on May 26, and (c) the inventory on May 31