You have been asked by your supervisor to estimate the cumulative time remaining required to complete a production run from Unit 50 to 500. You suspect that there is a learning curve associate with the production, so you review the work order and invoices to discover that the 10 h unit of production required 500 total man hours to complete, and it looks like the 50 h will require 400 hours to complete. Determine the time required to complete the remaining production run (50 to 500)