$6\mathrm{.}90$ Figure P$6\mathrm{.}90$ shows a simple vapor power cycle operating at steady state with water as the working fluid. Data at key locations are given on the figure. Flow through the turbine and pump occurs isentropically$.$ Flow through the steam generator and condenser occurs at constant pressure. Stray heat transfer and kinetic and potential energy effects are negligible. Sketch the four processes of this cycle in series on a $\backslash ($ T$-$s $\backslash )$ diagram. Determine the thermal efficiency.