TeX source:

\begin{aligned} \% \text { change in quantity } &=\frac{13,000-10,000}{(13,000+10,000) / 2} \times 100 \\ &=\frac{3,000}{11,500} \times 100 \\ &=26.1 \\ \% \text { change in price } &=\frac{\$ 700- \$ 650}{(\$ 700+\$ 650) / 2} \times 100 \\ &=\frac{50}{675} \times 100 \\ &=7.4 \\ \text { Price Elasticity of Supply } &=\frac{26.1 \%}{7.4 \%} \\ &=3.53 \end{aligned}