Answer:
The contribution controllable by a segment manager is $ 1,850
Explanation:
Segment Manager`s performance is evaluated on be bases of items directly controllable by them ( controllable contribution)
Calculation of Controllable Contribution :
Net Sales                                     $5,250
Less Variable Costs :
Cost of merchandise sold                        (1,200)
Operating expenses                              (450)
Controllable Contribution                         3,600
Less Controllable Costs:
Fixed Cost Controllable                           (600)
Unallocated costs                               (1,150)
Contribution Controllable -Segment Manager         1,850