igh-Low Method, Cost Formulas luring the past year, the high and low use of three different resources for Fly High Airlines occurred in July and April. The resourc naintenance. The number of airplane flight hours is the driver. The total costs of the three resources and the related number of ai Required: Use the high-low method to answer the following questions. If an answer is zero, enter " 0 ". If required, round your answers to near 1. What is the variable rate for airplane depreciation? per flight hour