for a steady flow process from state $1$ to $2,$ enthalpy changes from h$1=400$kj$/$kg to h$2=100$kj$/$kg and entropy changes from s$1=1\mathrm{.}1$kj$/$kg$-$k to s$2=0\mathrm{.}7$kj$/$kg$-$k$.$ surrounding environmental temperature is $300$K$.$ neglect the changes in kinetic and potential energy. the change in availability of the system is$?$