An iceberg has mass 128,000 tonnes (1 tonne = 1000 kg) and is composed of pure ice with density 917 kg/m^3 and entrained gravel from rock with density 2750 kg/m^3. Take the density of seawater to be 1030 kg/m^3.

(a) If 95.5%% of the iceberg's volume is submerged, how much of its mass is ice?

(b) How much of its mass is rock?