Bonita Inc uses the perpetual inventory system and the weighted average cost formato value inventories on August 1, there were 4000 units valued at $15600 in the beginning inventory On August 10.8000 units were purchased for $6 perunt On August 15.7000 units were sold for $12 p unt. The amount charged to cost of goods on August 15 was O $33600 O $37100 O $42000 $28350