Explain the concept of concurrent delay and calculate number of days of extension to the schedule and amount of additional compensation the general contractor would be entitled to in a change order if the project experiences the following: April 1 - April 10 - delay from an owner directed change; April 8 - April 11 - rain delay. April 9-April 25 - contractor delayed by concrete sub having to rework sections. Assume general contractor's general conditions are $500 per day.