The legal assistants at a prestigious law firm have proposed a new search engine for their use. They charge their clients $645 for each title search and pay their clerks $27.25 per hour. Currently, a typical search process requires 46 minutes of each person's time. With the new tool, they will need only 36 minutes per search but the law firm will be charged $2.8 per search in fees. What is the percent change in multifactor productivity compared to the current search process? (Keep two decimal places in your answer)