Question

Gibbs Energy: Organic chemistry

What percentage of methylcyclohexane exists in the axial methyl conformation at equilibrium, given that K(eq)=19.5 at 25 degrees Celsius? R=1.987x10^-3 kcal/mol K.

a. 5% b. 19.5% c. 50% d . 95% e. 100%

I know the answer is a but I don't know why.