Beginning inventory, purchases, and sales data on Commodity A, as taken from Rich Company's perpetual inventory account, were as follows: July 1 Beginning inventory 5 units @4 -$20 15 units $5 =$75 6 SALE 16 UNITS 10 PURCHASE 15 UNITS @S6 20 SALE 11 UNITS 30 PURCHASE 10 UNITS @S7 31 SALE 7 UNITS Determine the cost of the ending inventory at JULY 31, by: (a) the first- in-first- out method, and (b) the last-in- first- out method.