William Company Uses the Periodic Inventory System and Has Provided

William Company uses the periodic inventory system and has provided the following data:
$$\begin{array} { l r r } & \text { Units } & \text { Amount } \\\text { Beginning inventory } & 6,000 & \$ 30,000 \\\text { Purchases } & 32,000 & 192,000 \\\text { Sales } & 28,000 & 280,000\end{array}$$ Requirement 1:
Calculate the following using both FIFO and LIFO inventory methods. $\begin{array}{ll} & \$ \text { FIFO } & \$ \text { LIFO } \\\text { A. Ending inventory }& \$----& \$----\\\text { B. Cost of Goods Sold }& \$----& \$----\\\text { C. Gross margin }& \$----& \$----\\\end{array}$ Requirement 2:
Conceptually,how does pretax income using FIFO (in times of rising prices)compare to LIFO pretax income? Explain your answer.