SECTION 1. The Division of Investigation of the National Bureau of Investigation shall have one chief to be known as the Chief, Investigation Division and Evaluation officer, whose annual salary shall be six thousand two hundred forty pesos. He shall be assisted by fourteen supervising agents each of whom shall receive six thousand pesos per annum who may be assigned heads of district offices of the bureau such other duties as the Director of the National Bureau of Investigation may assign. There shall also be fourteen senior investigation agents each of whom shall receive five thousand seven hundred sixty pesos per annum, and one hundred seven investigation agents whose salaries shall be as follows:
Thirty-seven investigation agents, five thousand three hundred seventy-six pesos per annum each;
Five investigation agents, four thousand eight hundred sixty pesos per annum each; and
Sixty-five investigation agents, four thousand one hundred eighty-eight pesos per annum each.