With reference to the human resource planning example in Ch.5 (see Figure 5. 3), please compute the number of external hires for each of the three jobs below. Sales Rep Supervisors Store Managers Predicted Future Needs 250 50 30 Current employees Currently in position 100 20 10 Expected to quit 20 4 3 Expected to move internally to other jobs 30 10 0 Expected to move internally to this job 0 30 10 External hiring need