A boiler produces \(900 \mathrm{~kg}\) of wet steam per hour at a pressure of 7 bar. The dryness fraction of steam is 0.96 . Feed water temperature is \(20^{\circ} \mathrm{C}\). If boiler efficiency is \(75 \%\), calculate the amount of coal burnt per hour. Calorific value of coal is \(32,500 \mathrm{~kJ} / \mathrm{kg}\).