The? short-term demand for crude oil in Country A in 2008 can be approximated by q equals f left parenthesis p right parenthesis equals 2 comma 144 comma 309 p Superscript negative 0.05 ?, where p represents the price of crude oil in dollars per barrel and q represents the per capita consumption of crude oil. Calculate and interpret the elasticity of demand when the price is ?$79 per barrel.
The elasticity of demand for oil is ____ .
?(Type an integer or a? decimal.)