In the extrusion of cold chocolate from a tube, work is done on the chocolate by the pressure applied by a ram forcing the chocolate through the tube. The work per unit mass of extruded chocolate is equal to p/p, where p is the difference between the applied pressure and the pressure where the chocolate emerges from the tube, and p is the density of the chocolate. Rather than increasing the temperature of the chocolate, this work melts cocoa fats in the chocolate. These fats have a heat of fusion of 150kJ/kg. Assume that all of the work goes into that melting and that these fats make up 30% of the chocolates mass. What percentage of the fats melt during the extrusion if p = 5.5MPa and p = 1200 kg/m3?