Retirement Benefits.
Section 75
SEC. 75. Retirement Benefits. — Monthly retirement pay shall be fifty percent (50%) of the base pay and longevity pay of the retired grade in case of twenty (20) years of active service, increasing by two and one–half percent (2.5%) for every year of active service rendered beyond twenty (20) years to a maximum of ninety percent (90%) for thirty–six (36) years of active service and over.