The first building constructed by a contractor required 1,850 worker-hours for completion. The improvement rate (learning curve) for additional, identical buildings is expected to be 90%. a. How many hours will be required to complete the 4th building? (2 points) b. How many hours will be required to complete the 23rd building? (2 points) c. If he uses a four-worker crew, how many total workdays (8-hour days) should the contractor allocate in his schedule to complete buildings 15 through 17? (2