Beginning inventory, purchases, and sales data on Commodity A, as taken from Rich Companys 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 @$6

20 SALE 11 UNITS

30 PURCHASE 10 UNITS @$7

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.