Separating Mixed Costs to get the Cost Equation 1. The OLS Regression Method for Separating Mixed Costs Gilligahn's Fishing an Tackle Company owns two fishing boats that are used by employees on guided fishing tours. Expenses for the boats, excluding depreciation, by month for the most recent quarter are presented below: Quarter July August September Hours 550 500 200 1.250 Expenses $ 2200 2000 1000 $5,200 Required: Determine the cost formula using the OLS method (round to the nearest tenth of a cent)