SSC JE Electrical Engineering 2017 Set 4 Paper

A glass factory hires 11 craftsmen by paying each of them Rs 1100 per day. The 12th craftsman demands Rs 1200 per day. If this craftsman is hired then all other craftsmen must be pad Rs 1200. The marginal resource (labour) cost of the 12${}^{\mathrm{th}}$ craftsman is _______ .