§ 226. Wages for such work; prevailing rate. The wages to be paid for a day's work of eight hours as referred to hereinbefore, to laborers, workmen or mechanics upon such public works shall be not less than the prevailing rate for a day's work in the same trade or occupation in the locality within the state where such public work on, about or in connection with which such labor is performed in its final or completed form is to be situated, erected or used and shall be paid in cash. Every contract for such elimination work, hereafter entered into, shall contain a provision that each laborer, workman or mechanic, employed by a contractor, subcontractor or other person about or upon such public work, shall be paid the wages herein provided.