The Following Are Data Available for Blue Grass for the Month

The following are data available for Blue Grass for the month of June: $$\begin{array} { | l | r | l | } \hline \text { Sales } & 1,200 & \text { units } \\\hline \text { Beginning inventory } & 300 & \text { units } @ \$ 4.00 \\\hline \text { Purchases, in chronological order } & 600 & \text { units } @ \$ 4.20 \\\hline & 400 & \text { units @ \$4.40 } \\\hline & 500 & \text { units } @\$ 4.50 \\\hline\end{array}$$ (a.) Calculate cost of goods sold and ending inventory under the following cost flow assumptions:
(1.) Weighted-average
(2.) FIFO
(3.) LIFO
(b.) Assume net income using the weighted average cost flow assumption was $6,400. Calculate net income under FIFO and LIFO.