periodic inventory system.

$\backslash$table$[[$Date$,$Explanation,Units,Unit Cost,Total Cost$],[$Sept$.1,$Inventory,$15,$$$114,$$$1,710],[12,$Purchase,$45,116,5,220],[19,$Purchase,$50,118,5,900],[26,$Purchase,$20\_,119,2,380],[,$Total,$130\_,,$$$15,210]]$

Compute the ending inventory at September $30$ using the FIFO, LIFO and average$-$cost methods.

$\backslash$table$[[,$FIFO,LIFO,AVERAGE$-$COST,,$],[$Ending inventory at September $30,$$$,,$$$,$$$,]]$

Compute the cost of goods sold at September $30$ using the FIFO, LIFO and average$-$cost methods.

$\backslash$table$[[,$FIFO,LIFO,AVERAGE$-$COST,$],[$Cost of goods sold,$$,$$$,$$$,]]$