Calculate Bill

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 //prg to calc elec bill using if  
 //Downloaded From www.c4cpp.co.nr. (C)2009.All rights reserved.  
 #include<iostream.h>  
 #include<conio.h>  
 void main()  
 {  
 clrscr();  
 float r,a,u;  
 cout<<"Enter Your Rn + Elec Bill"<<endl;  
 cin>>r>>u;  
 if(a<=100)  
 a=u*.40+50;  
 else  
 if((u>100) && (u<=300))  
 a=100*.40 + (u-100)*.50 + 50;  
 else  
 a=(100*.4 + 200*.50 + (u-300)*.60 + 50);  
 cout<<"Bill = "<<a;  
 getch();  
 }