Required: 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 2,500,000keys at a total cost $10,000 in 2021 , and total production of 3,000,000 keys at a total cost of $20,000 in 2022 , what is the variable cost per key? (Round your answer to 2 decimal places.)