$-$The $\%$ exceedance, flow and Tail Water Elevation $($TWE$)$ are given in the table

below for a potential hydropower site. If the headwater elevation is constant at $985$

feet and the overall efficiency of the plant is $72\%,$ what is the plant capacity factor

for a $21$MW power plant?

a$)0\mathrm{.}96$

b$)0\mathrm{.}89$ The correct answer is $($ b$)0\mathrm{.}89$

c$)0\mathrm{.}64$

d$)1\mathrm{.}0$