Section 20
SEC. 20. Paragraph (a) of Article 191 of the Code is hereby amended to read as follows: "(a) Under such regulations as the Commission may approve, any employee under this Title who contracts sickness or sustains an injury resulting in permanent total disability shall, for each month until death but not exceeding five years, be paid by the System during such disability an income benefit to be computed as follows: "Fifty-one and seventy-five hundredths percent of the first three hundred pesos of average monthly salary credit or fraction thereof; plus "Twenty-eight and seventy-five hundredths percent of the next three hundred pesos of average monthly salary credit or fraction thereof; plus "Ten and thirty-five hundredths percent of each succeeding one hundred pesos of average monthly salary credit or fraction thereof; plus "One thousand-thirty-five-ten thousandths of one percent of the average monthly salary credit for each month of paid coverage in the System in excess of one hundred twenty months of paid coverage as of the last day of the second quarter preceding the quarter of disability: Provided, that the monthly income benefit shall not be less than forth-five pesos."