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.

$\backslash$table$[[.,$Sales Rep,Supervisors,$\backslash$table$[[$Store$],[$Managers$]]],[$Predicted Future Needs,$250,50,30],[$Current employees$],[\backslash$table$[[$Currently in$],[$position$]],100,20,10],[$Expected to quit,$20,4,3],[\backslash$table$[[$Expected to move$],[$internally to other$],[$jobs$]],30,10,0],[\backslash$table$[[$Expected to move$],[$internally to this$],[$job$]],0,30,10]]$