The following information pertains to Mason Company for Year $2.$

Beginning inventory $116$ units @ $$30$

Units purchased $358$ units @ $$45$

Ending inventory consisted of $42$ units. Mason sold $432$ units at $$90$ each. All purchases and sales were made with cash. Operating expenses amounted to $$3,375.$

Required

a$.$ Compute the gross margin for Mason Company using the following cost flow assumptions: $(1)$ FIFO, $(2)$ LIFO, and $(3)$ weighted average.