please help! compute Ke and Kn under the following circumstances

a$.D_1=$$$6\mathrm{.}60,P_0=$$$76,g=6\%,F=$$$4\mathrm{.}00.$

Note: Do not round intermediate calculations. Round your answers to $2$ decimal places.

b$.D_1=$$$0\mathrm{.}35,P_0=$$$36,g=10\%,F=$$$1\mathrm{.}50.$

Note: Do not round intermediate calculations. Round your answers to $2$ decimal places.

c$.E_1($earnings at the end of period one$)=$$$10,$ payout ratio equals $25$ percent, $P0=$$$40,g=9\mathrm{.}0\%,F=$$$2\mathrm{.}50.$

Note: Do not round intermediate calculations. Round your answers to $2$ decimal places.