Smash their calculator(s).
I am semi-serious.
Last week I had several first-year university students complain because I will not let them use calculators on exams, and they did not know how to calculate a present value problem which was basically the following:
NPV = 1210/(1 + .1) + 1210/(1 + .1)(1 + .1) - 2000
I know I seem like a curmudgeon, but this reaction from university students (who presumably had "A" averages in secondary school) is frightening and discouraging.
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