Compute the required values under the following circumstances: $($Do not round intermediate calculations. Round the final answers to $2$ decimal places.$)$

a$.D_1=$$$9\mathrm{.}20$;$P_{}=$$$100$;$g=7\%$;$F=$$$2\mathrm{.}00.$

$\backslash$table$[[K_e,16\mathrm{.}20],[K_n,16\mathrm{.}39]]$

b$.D_1=$$$0\mathrm{.}18$;$P_{}=$$$35$;$g=10\%$;$F=$$$2\mathrm{.}50.$

$\backslash$table$[[,,],[K_e,10\mathrm{.}51,],[K_n,10\mathrm{.}55,\%$