[redsable]

Be honest. Tell HR the truth. Tell them the other company has offered you a much bigger salary. Tell them that salary is very important to you at this stage of your life.

The big question.....have you signed a contract? If not then get the second contract signed before you diss the first. You never know what might happen. Even if it entails traveling there to sign the contract...do it. And while you are there go in person to the first company that offered you. I believe that until you sign the contract you still have room to make changes. The contract is the key. If you have already signed a contract with the first company it could mean trouble. That changes everything.