In the generational model, if B $=0\mathrm{.}5,$ u $=0\mathrm{.}5,4=1,$ and the initialvalue for public capital is$80=0\mathrm{.}08,$ then the public capital value in period $1$ is a$.0\mathrm{.}020$b$.0\mathrm{.}040.0\mathrm{.}057$d$.0\mathrm{.}063$