Respuesta :

Part A:

Electricity Company | Rate Charged | Rate Rounded |

    Atlas Energy                12.065                12.070

   Big City Light                 9.138                  9.140              

        Connex                      9.143                  9.140

  Dynamon Power            9.707                  9.710

       ElectriCo                    9.503                  9.500

Part B:

Big City Light and Connex.

Part C:

Two companies can have the same rate when they are rounded because two numbers can be rounded to the same number although they are different numbers. For example; 9.138 and 9.143 can both be rounded to 9.140.