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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}