With reference to the human resource planning example in Ch$\mathrm{.}5($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

$?$

$?$

$?$