Belowis a series of cost of goods sold sections for companies Sandhill, Pronghorn. Thomas, and Teal Mountain. All of these companies use a periodic inventory system. Fill in the lettered blanks to complete the cost of goods sold sections. Thomas Teal Mountain \begin{tabular}{rrr} $980 & $5,820 \\ \hline & f. & \\ \hline 1,421 & 42,720 \\ \hline 7.448 & & \\ \hline \end{tabular}