an amount, on account of the required minimum period of service, equal to fifty percent of his or her final average salary; plus an amount on account of allowable service as an EMT member, or fraction thereof, beyond such required minimum period of service equal to two percent of his or her final salary for such allowable service as an EMT member during the period from completion of twenty-five years of allowable service as an EMT member to the date of retirement but not to exceed more than five years of additional service as an EMT member.
N.Y. Retire. and Soc. Sec. Law § 604-E