This document provides a breakdown of costs for the fabrication of Stairway E4 in Sector 3. It includes costs for materials, labor, equipment rental, transportation, and indirect costs like meals and taxes. The total cost of production is 14,339.93 Soles. Materials cost 5,757.94 Soles. Labor costs include 3,720 Soles for a mechanic welder and supervisor. Equipment rental is 250 Soles and transportation is 320 Soles. Indirect costs total 505 Soles for meals and taxes. The final cost includes a 10% markup for profits and another 10% for general expenses.