HP plans to cut 27,000 jobs

Arik Hesseldahl for All Things D, quoting from HP’s 8K SEC filing:

As part of the restructuring plan, HP expects approximately 27,000 employees, or approximately 8% of the company’s workforce as of October 31, 2011, to exit the company by the end of fiscal 2014, with a portion of those employees exiting the company as part of a voluntary early retirement program for U.S. employees whose combined age and years of service exceed certain levels.

I wonder what “portion” of the 27,000 will be allowed to retire.