Cost of equity using DDM will be calculated as -
Under DDM,
cost of equity = Expected dividend / Current price + Growth rate
cost of equity = ($ 0.84 ( 1 + 5.4%) / % 83.25) + $ 5.4 %
cost of equity = 6.46%
Under SML, cost of equity will be calculated as -
Cost of equity = Risk free return + Beta * ( Market return - Risk free return)
Cost of equity = 5.4 % + 1.34 * ( 11.9 % - 5.4 %)
Cost of equity = 14.11 %