Rationalize the numerator.Then simplify your answer. 
Definitions:
Enantiomeric Excess
A measurement of the purity of an enantiomer in a mixture, defined as the difference in percentage between the two enantiomers.
Diastereomers
Stereoisomers which aren't each other's mirror reflections and possess distinct physical characteristics.
Geometric Isomers
Molecules with the same molecular formula and sequence of bonded atoms (constitution), but differing in the three-dimensional orientations of their atoms in space.
(E)-2-pentene
An alkene with the formula CH3CH=CHCH2CH3 where the two substituents on the double bond are on opposite sides, denoted by the (E) configuration.
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