Reactants are defined at 0 kJ·mol⁻¹. The uncatalyzed mechanism for a reaction proceeds through three transition states with energies of 50 kJ·mol⁻¹, 90 kJ·mol⁻¹, and 80 kJ·mol⁻¹, respectively. A catalyst lowers the energy of the second transition state by 55 kJ·mol⁻¹, leaving the other two unchanged. Identify the rate-determining transition state for the catalyzed pathway and state the overall activation energy, in kJ·mol⁻¹, for the catalyzed reaction, using the given values to justify your answer.