Q$2$ A $25-$storey apartment block with a basement is to be constructed on a raft foundation which will rest at $10m$ depth from the ground surface and has $30x40m$ dimensions. The ground water level is also at $10m$ depth. The gross foundation pressure is $350$kPa. The soil profile consists of $30m$ deep loose to medium dense sand $($:$k\frac{N}{m^3}$