[xoxoxo]

I've been trying to solve this question, but I have no clue where to start from. Someone help me out please.

question... pure (s)-amphetamine has a specific rotation of +37.6 degree. If a mixture of (S) and (R) emphetamine has a specific rotation of -21.0 degree, Calculate the percentage of each enantiomer present in the mixture.

[azmanam]

start here:

http://cas.bellarmine.edu/chem117a/topics/jan27.htm
http://academics.triton.edu/faculty/lpytlewski/CHM234Chapter5PDFNotes/OrganicCHP5G12.pdf