ANSWER IS NOT 1.67

Consider the photochemical isomerization A = B. At 650. nm, the quantum yields for the forward and reverse reactions are 0.83 and 0.52, respectively. If the molar absorptivities at 650. nm of A and B are 1.2x103 Lmol-1.cm-1 and 4.5x102 L.mol-1.cm-1, respectively, what is the ratio [B]/[A] in the photostationary state? [B] = 4.91.67 x [A]