Answer: b.) 0.8;inelastic
Step-by-step explanation:
 Price elasticity of demand is defined as change in the quantity demanded of a particular product with changes in price . 
 Price Elasticity of Demand = Percentage Change in Quantity Demanded / Percentage Change in Price.
Given that
 price of electricity falls by 10% 
Demand for electricity subsequently increases by 8%. 
W e have that 
 Price Elasticity of Demand = 8% / -10% = (-) 0.8 The negative sign shows that the price of electricity and demand are inversely proportional.
 Price Elasticity of Demand = 0.8 since the Price elasticity is less than 1 , then it is inelastic