A bunker-fired steam generating unit consumes 6 Metric Tons per hour of bunker having a heating value of 41,000 kJ/kg with a boiler efficiency of 80%. It is desired to convert this boiler to coal-fired using local having an average heating value of 29,000 kJ/kg. Using coal, however, the boiler efficiency is only 75%. 

What will be the coal consumption so that the boiler will maintain its steaming capacity?