a$.,$ b$.,$ and c$.$ Determine the cost of goods sold and ending merchandise inventory using the $($a$)$ FIFO inventory costing method, $($b$)$ LIFO inventory costing method, and $($c$)$ weightedaverage inventory costing method assuming Peaceful Books uses the periodic inventory system. $($Round weighted average cost per unit to the nearest cent and all other amounts to the n

earest dollar.$)$

a$.$

b$.$

c$.$