Pennsylvania has 2,560 bridges. It has been estimated that it requires three days for an inspector to travel to, inspect, and write a report on one bridge. Assume 250 working days per year. a. If the state desires each bridge to be inspected at least once every two years, what is the maximum number of inspectors required? b. If it turns out that the overall efficiency of the inspectors is 80%, how many inspectors would be required?