In a S.H.M. when the displacement is one half the amplitude, what fraction of the total energy is kinetic ?

In case of S.H.M.  K.E.=12mω2a2−x2 ∴  K.E. =12mω2a2−(a/2)2 ,( when x=a/2) =3412mω2a2 total energy =12mω2a2 raction of total energy = K.E.  Total energy =3412mω2a212mωa2=34