 (a)  For 80% lagging power factor of load   
 
 voltage regulation (%)=   
 
    94.804478  
 
 (b)  For Unity power factor of load   
 
 voltage regulation (%)=   
 
    55.02296  
 
 (c)  For 80% leading power factor of load   
 
 voltage regulation (%)=   
 
  - 0.2564051 