Refer to the Figure.which Element Is the Independent Variable

Refer to the Figure.Which element is the slope? A) variable rate B) output C) fixed cost D) total cost

Suppose that at a given volume,total costs and fixed costs are known.How are the variable costs per unit computed? A) (total costs − fixed costs) / unit volume B) (total costs / unit volume)− fixed costs C) (total costs × unit volume)− (fixed costs / unit volume) D) total costs − (fixed costs / unit volume)