Answer: 0.5 making the demand for gas to be inelastic in this range.
Explanation:
The price elasticity of demand is calculated as:
= % change in quantity demanded / % change in price
= 15% / -30%
= -0.5
Based on the above calculation, we can see that the elasticity of demand equals to 0.5. Since, it is less than 1, it is said to be inelastic.