Snickers Company has two investment centers and has developed the following information:
  | 
 Department A 
 | 
 Department B 
 | 
| 
 Net operating income 
 | 
 $120,000 
 | 
 ? 
 | 
| 
 Average operating assets 
 | 
 ? 
 | 
 $400,000 
 | 
| 
 Sales 
 | 
 800,000 
 | 
 250,000 
 | 
| 
 ROI 
 | 
 10% 
 | 
 12% 
 | 
Required:
a) What was the amount of Department A's average operating assets?
b) What was the amount of Department B's net operating income?
c) If Department B is able to reduce its operating assets by $100,000, what would be Department B's new ROI?
d) If Department A is able to increase its net operating income by $60,000 by reducing expenses, what would be Department A's new ROI?