Answer:
d. If the manager invests in the additional project, residual income of the division will increase. 
Step-by-step explanation:
RI = Operating Income - (Operating Assets x Minimum Required Rate of Return) 
 
with adding the additional project 
 
Operating Income: $60000 +6000 =$66000 
Operating Assets: $375000+$40000 =$415000 
 
Residual income =$66000-14%*$415000 =$7900 
Consider the attached information.