A man can do much as a woman can do a work in 3 days. A child does 2/3 of the work in a day as a woman. If a contractor hires 45 pairs of hands – men, women, and children in the ratio of 1 : 2 : 2 and pays them in all Rs.1235 at the end of the day. What must the daily wage of a man be, if the wages are proportional to the amount of work done?