Many people enter the nonprofit sector because they want to help people. What they do not realize is that nonprofit organizations also have funding needs to meet. Assure the interviewer that you will not shy away from aggressive fundraising targets.
"I have had multiple sales positions and have also owned my own business in the past. I fully understand that a nonprofit organization still has a bottom line. In my last position with ABC, I was tasked with raising $500K per quarter in charitable contributions."
"In my most recent position I have had multiple targets to reach; whether geared towards dollars, volunteer hours, or regular sponsorship's. I am always on top of my KPI's and targets, setting clear and achievable milestones for myself."