Brona Company makes treadmills. The company controller wants to calculate the fixed and variable costs associated with the janitorial costs incurred in the factory. Data for the past four months were as follows: 770 September $12,500 October 15,000 800 November 12,000 600 December 13,200 630 Using the high-low method, calculate the fixed cost of the janitorial services. $3,000 o $6,000 O $5,230 O None of these are correct