Finding Light Bill as Unit

              main()  
              {  
                  float u, amt, rate;  
                  clrscr();  
              
                  printf("\n Enter unit");  
                  scanf("%f", &u);  
              
                  if (u >= 1 && u <= 100)  
                  {  
                      rate = 5;  
                  }  
                  else if (u >= 101 && u <= 200)  
                  {  
                      rate = 6;  
                  }  
                  else if (u >= 201 && u <= 300)  
                  {  
                      rate = 7;  
                  }  
                  else  
                  {  
                      rate = 8;  
                  }  
              
                  printf("\n Rate: %f", rate);  
                  amt = rate * u;  
                  printf("\n Total: %f", amt);  
              
                  getch();  
              }  
              

Output: