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\input{preamble-standalone.ltx}
\begin{document}
% Ex. No. 64 (Section 14.5 : Un peu de tout)
\begin{tikzpicture}[scale=.8]
\tkzInit[xmin=5,xmax=40,ymin=0,ymax=350,xstep=2.5,ystep=25]
\tkzDrawX[label=$q$]
\tkzLabelX
\tkzDrawY[label=$C(q)$]
\tkzLabelY
\tkzGrid
\tkzFct[domain=5:40]{0.1*\x**2+2*\x+60}
\foreach \vv in {5,10,...,40}{%
\tkzDefPointByFct(\vv)
\tkzDrawPoint(tkzPointResult)}
\tkzFct[domain=5:40]{(108*log(\x)-158)}
\tkzText(37.5,280){$C$}
\tkzText(37.5,220){$R$}
\tkzDefSetOfPoints{%
5/15,10/90,15/135,20/170,25/190,30/200,35/230,40/240}
\tkzDrawSetOfPoints[mark = x,mark size=3pt]
\end{tikzpicture}
\end{document}
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