The cost of equity is calculated as -
Cost of equity = Expected dividend / Current price + Growth rate
Expected dividend = Current dividend * ( 1 + growth rate)
Expected dividend = $ 2.40 * ( 1 + 5.5%) = $ 2.532
Current price = $ 52
Growth rate = 5.5 %
Cost of equity = ($ 2.532 / $ 52) + 5.5 %
Cost of equity = 10.37 %