Novak World provided the following data concerning its costs of operating and the number of riders of its Scream ride and the related linear regression for selected operation months: January February March April May June Riders 3600 3500 3000 2840 3200 3400 Operating costs $10720 $10560 $9300 $9086 $9810 $10650 Using the high-low method, what is the unit variable cost for the Scream ride? $2.33 $2.37 $2.15 $2.29