4. Presented below is the production data for the first six months of the year for the mixed costs incurred by London Company. Month January February March April May June Cost $73,350 60,360 97,200 132,600 87,000 110,040 Units 12,300 9,600 15,900 22,500 14,400 19,800 London Company uses the high-low method to analyze mixed costs. What is the variable cost per unit? SHOW WORK