The elasticity of demand is calculated as the percentage change in quantity divided by the percentage change in price. 

%Change in quantity = 12 - 10 = 2
Percentage change = \(\frac{2}{10}\) = 0.2

Change in price = 8 - 6 = 2
Percentage change = \(\frac{2}{8}\) = 0.25

Elasticity of demand = \(\frac{0.2}{0.25}\) = 0.8