Answer:
15%
Step-by-step explanation:
Use Dividend discount model to find the required return of equity or cost of equity capital;
Return r formula;

whereby; D1 = Next year's dividend = $2.10
P0 = Current price = $17.50
Growth rate; g = 3% or 0.03 as a decimal
Next, plug in the numbers to the formula above to calculate the cost of equity;
r

r = 0.15 or 15%
Therefore, cost of equity is 15%