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 3,900,000 keys at a total cost of $18,500 in 2021, and total production of 4,700,000 keys at a total cost of $37,000 in 2022, what is the variable cost per key? (Round your answer to 3 decimal places.)

variable cost per key =