Working for a not-for-profit corporation like the Canadian Red Cross can often mean leaving salary on the table for similar jobs in the private business sector. The true intent in asking a question like this is for your interviewer to hear that you are not solely motivated by your salary, but rather by helping live the mission that you will be undertaking there. You can strike a balance by choosing to discuss any salary requirements that you may have if you wish to do so, but be sure to focus a majority of your answer on your desire to help live their mission and values daily. Ensure your interviewer walks away hearing your passion and motivation for the role you are being considered for.