The Puma health plan uses return on investment (ROI) and residual income (RI) to measure the performance of its investment centers. Two of these investment centers are identified as X and Y. Investment Center X earns $10,000,000 in operating income on controllable investments of $50,000,000, and it has total revenues of $60,000,000. Investment Center Y earns $2,000,000 in operating income on controllable investments of $8,000,000, and it has total revenues of $10,000,000. Both centers have a minimum required rate of return of 15%.

One difference between the RI method and the ROI method is that