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Arthan Corporation's relevant range of activity is 3,840 units to 8,960 units. When it produces and selis 6,400 units, its average costs per unit are as follows: Required: a. If 7,680 units are produced, what is the total amount of fixed manufacturing cost incurred? b. If 7,680 units are produced, what is the total amount of manufacturing overhead cost incurred? What is this total amount expresse on a per unit basis? Note: Round per unit manufacturing overhead cost to 2 decimal places. If 5,120 units are produced, what is the total amount of direct manufacturing cost incurred? If 5,120 units are produced, what is the total amount of indirect manufacturing cost incurred