Assume Webster Company buys bicycle helmets at a unit cost of $$33$ and sells them at a unit price of $$53.$ There was no inventory at the beginning of the period $.$ Required: Prepare the journal entries to record the following A$.$ Purchased $240$ units for cash assuming the perpetual inventory system is used B$.$ Purchased $240$ units for cash assuming the periodic inventory system is used. C$.$ Sold $240$ units for cash assuming the perpetual inventory system is used Sold $240$ units for cash assuming the periodic inventory system is used.