The University of Hawaii Board of Regents unanimously selected M.R.C. Greenwood today to become the next UH president after current UH President David McClain steps down on July 31. Greenwood, 66, will be the first woman to lead the 10 campus UH system. Greenwood will be paid $475,008 a year, board chairman Allan Landon said. But if UH administrators, as expected, are asked to take a salary cut because of the state’s budget crisis, Greenwood’s salary would be reduced by the same percentage. McClain makes $414,096. Landon said the regents raised the salary for the position because a salary survey showed that was the amount needed to attract top candidates. Greenwood will start no later than Aug. 24, Landon said. She will have a three-year contract with options for renewal for each of the next two years. The position also comes with the use of College Hill, the UH president’s residence, a car allowance and expense account. Landon said Greenwood was “the best fit” as president, citing her research background and experience in higher education.