Answer: 
a. The value of ending Inventory using FIFO is $2749.
b. The value of ending Inventory using LIFO is $2667.
c. The value of ending Inventory using Average Cost method is $2713.
We have:
Date     Explanation       Units      unit cost   Total Cost
Sep-01         inv                 11              97                1067
Sep-12	purchases        44               100              4400
Sep-19	purchases         47               101              4747
Sep-26	purchases         22               102              2244
Total                                 124                                  12458
Novak sold 97 snowboards, so the number of snowboards with it at the end of September is  .
.
If Novak adopts First In First Out (FIFO) method, and 27 units are remaining, all 22 units purchased on Sept-26th and  from the purchases made on Sept-19th will remain in inventory.
 from the purchases made on Sept-19th will remain in inventory.
So the value of inventory using FIFO will be  
 
If Novak adopts Last In First Out (LIFO) method, all 11 units in inventory on  Sept-01st and  from the purchases made on Sept-12th will remain in inventory.
 from the purchases made on Sept-12th will remain in inventory.
Hence inventory value using LIFO will be  
 
We calculate the Average cost by dividing the Total Cost by total number of units purchased.

The value of inventory using the average cost method is  .
.