[工院]小窮神降臨，你損失了工院系學會費1000元
Let x=所交之系學會費，f(x)=工院動起來晚會應交的費用
g(x)=工院動起來大衛王應交的費用
f(x)=50 g(x)=0 when x≧1000
f(x)=400 g(x)=50 when x＜1000
Let p(x)=這次要收的錢 y=先前已繳過的系學會費
p(x)= 1000 - y + f(x) + g(x)
Trivial!!!
我明天晚上再收一次錢，
材導和質均的都請加油。
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