zane's vanes is a service that restores old weather vanes. zane has just spent $125 purchasing a 1920s-era weather vane which he expects to restore and sell for $500 once the work is completed. after having spent $125, zane realizes that he will need to spend an additional $200 on materials to complete the restoration. alternatively, he can sell the weather vane without restoring it for $200. what is his marginal cost to complete the restoration? answer
