Take out student loan or use my savings to pay tuition? Help

I am going into my fourth year of college, however I am enrolled in a dual degree program so I am starting graduate level classes at my university this year and am technically enrolled in both, but paying undergraduate tuition rates. The school has suggested an unsubsidized gov loan for about 7.5k, I have about 10-15k that I do not know how to pay, I have about 15k in savings/ various investment accounts. What should I do?