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Homework Statement
http://www.chegg.com/homeworkhelp/...lvingvpfirstlyunderstandingpartsq8278769
Homework Equations
I am having difficulties with this problem. It asks to find vo in terms of vs. For the gain, I got an equation of Vn/10 + (Vnvo)/40 = 0, so vo=5Vn. Since the op amp is ideal, vn=vp. Now for Vp is where i am having trouble. I have an equation of [48/60]vs  [48/60]4V=vp. But i am not sure if this right, I am not getting the correct answer. Help!
The Attempt at a Solution
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