The following data show the demand for an airline ticket dependent on the price of this ticket. 
For the assumed cubic and log-log regression models,Demand = β0 + β1Price + β2Price2 + β3Price3 + ε and ln(Demand) = β0 + β1ln(Price) + ε,the following regression results are available. 
Which of the following is the percentage of variations in ln(Demand) explained by the log-log regression equation?
Definitions:
Cent
A monetary unit equal to one hundredth of a larger unit, such as a dollar or euro.
Milligrams
A unit of mass equal to one thousandth of a gram, used primarily to measure small quantities of material.
Significant Figures
The digits in a number that are meaningful in terms of accuracy and precision, often used in scientific measurements.
Percent
A part per hundred used in expressing ratios, fractions, or portions of a whole.
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