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The elasticity of supply curve is computed through the Midpoint Method. To compute the elasticity of supply, the equations are used:

$$\begin{gathered} \%\mathrm{change}\mathrm{in}\mathrm{quantity}=\frac{{\mathrm{Q}}_2-{\mathrm{Q}}_1}{\left({\mathrm{Q}}_2+{\mathrm{Q}}_1\right)/2}×100 \\ \%\mathrm{change}\mathrm{in}\mathrm{price}=\frac{{\mathrm{P}}_2-{\mathrm{P}}_1}{\left({\mathrm{P}}_2+{\mathrm{P}}_1\right)/2}×100 \\ \mathrm{Price}\mathrm{elasticity}\mathrm{of}\mathrm{supply}=\frac{\%\mathrm{change}\mathrm{in}\mathrm{quantity}}{\%\mathrm{change}\mathrm{in}\mathrm{price}} \end{gathered}$$

$\begin{array}{rcl}\%\mathrm{change}\mathrm{in}\mathrm{quantity}& =& \frac{70-50}{\left(70+50\right)/2}×100\\ & =& \frac{20}{120/2}×100\\ & =& \frac{20}{60}×100\\ & =& 33.33\%\end{array}$

$\begin{array}{rcl}\%\mathrm{change}\mathrm{in}\mathrm{price}& =& \frac{9-8}{\left(9+8\right)/2}×100\\ & =& \frac{1}{17/2}×100\\ & =& \frac{1}{8.5}×100\\ & =& 11.76\%\end{array}$

$\begin{array}{rcl}\mathrm{Price}\mathrm{elasticity}\mathrm{of}\mathrm{supply}& =& \frac{33.33}{11.76}\\ & =& 2.83\end{array}$

As the price elasticity value of supply curve is greater than 1, the supply curve is elastic in this part.

$\begin{array}{rcl}\%\mathrm{change}\mathrm{in}\mathrm{quantity}& =& \frac{88-80}{\left(88+80\right)/2}×100\\ & =& \frac{8}{168/2}×100\\ & =& \frac{8}{84}×100\\ & =& 9.52\%\end{array}$

$\begin{array}{rcl}\%\mathrm{change}\mathrm{in}\mathrm{price}& =& \frac{11-10}{\left(11+10\right)/2}×100\\ & =& \frac{1}{21/2}×100\\ & =& \frac{1}{10.5}×100\\ & =& 9.52\%\end{array}$

$\begin{array}{rcl}\mathrm{Price}\mathrm{elasticity}\mathrm{of}\mathrm{supply}& =& \frac{9.52}{9.52}\\ & =& 1\end{array}$

As the price elasticity value of supply curve is equal to 1, the supply curve is unitary elastic in this part.

$\begin{array}{rcl}\%\mathrm{change}\mathrm{in}\mathrm{quantity}& =& \frac{100-95}{\left(100+95\right)/2}×100\\ & =& \frac{5}{195/2}×100\\ & =& \frac{5}{97.5}×100\\ & =& 5.13\%\end{array}$

$\begin{array}{rcl}\%\mathrm{change}\mathrm{in}\mathrm{price}& =& \frac{13-12}{\left(13+12\right)/2}×100\\ & =& \frac{1}{25/2}×100\\ & =& \frac{1}{12.5}×100\\ & =& 8\%\end{array}$

$\begin{array}{rcl}\mathrm{Price}\mathrm{elasticity}\mathrm{of}\mathrm{supply}& =& \frac{5.13}{8}\\ & =& 0.64\end{array}$

As the price elasticity value of supply curve is less than 1, the supply curve is inelastic in this part.