Peppers Lockdown produces keys for homes and cars. As Peppers planned for next year's production, the company decided to implement a high-low system to forecast future costs. With total production of 4,000,000 keys at a total cost of $19.000 in 2018 and total production of 4.600,000 keys at a total cost of $38.000 in 2019 what is the variable cost per key? (Round your answer to 2 decimal places.) por ky