Imagine a Hypothetical Reaction to Make a Chiral Molecule That $[ \alpha ] _ { \mathrm { D } } ^ { 20 }$

Short Answer

Imagine a hypothetical reaction to make a chiral molecule that gives the desired product (the R enantiomer, which has a specific rotation of −55^o mL g⁻¹ dm⁻¹) in 40% EE. What is the specific rotation of the S enantiomer?
$[ \alpha ] _ { \mathrm { D } } ^ { 20 }$