help 8,9,10 plz

Reba, Inc, uses a periodic inventory system. At the end of the January 31, 2017, the accounting records for the most popular item in inventory showed the following: Reba sells the units for $20 each. At the end of the period, Reba has 115 units remaining in inventory. What is the cost of goods sold if Reba uses the FIFO method? Radley, Inc, uses a periodic inventory system. At the end of the January 31,2017 , the accounting records for the most bopular item in inventory showed the following: Radley sells the units for $20 each. At the end of the period, Radley has 134 units remaining in inventory. What is the cost of goods sold if Radley uses the LIFO method? QUESTION 10 Hadley Bear, Inc. uses a periodic inventory system. At the end of the January 31, 2017, the accounting records for the most popular item in inventory showed the following: Hadley Bear sells the units for $20 each. At the end of the period. Hadley Bear has 156 units remaining in inventory. What is value of the ending inventory if Hadley Bear uses the average cost method