The equation for total annual operating cost is given by the equation Total Cost = $11,000 - $0.3 * Fleet Miles
The high-low cost estimation model is used for separating the fixed cost from the variable cost if only the mixed cost data is on hand. Companies often use this method to develop the cost model used for predicting future costs.
First, we estimate the variable cost as
Variable Cost = (Cost at the highest activity level - Cost at the lowest activity level)/(Miles at the highest activity level - Miles at the lowest activity level)
Variable Cost = ($267,500 - $219,500)/(855,000 - 695,000) = $48,000/160,000 = $0.3 per fleet mile
Then, we estimate the fixed cost as
Fixed Cost = Cost at the highest activity level - Variable Cost * Miles at the highest activity level
Fixed cost = 267500- 0.3*855000 = 11000
Finally, the cost-estimating equation for the total annual operating costs can be formulated as
Total Cost = Fixed Cost - Variable Cost * Fleet Miles
Total Cost = $11,000 - $0.3 * Fleet Miles
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