Following are the results of the capital structure analysis SoCal Irrigation just completed:
Proportion Stock Price Earnings per of Debt (per share) Share (EPS)
20% $44.50 $1.20
40 45.15 1.26
60 45.20 1.22
80 44.95 1.18
According to this information, what is SoCal's optimal capital structure? (answer no percentage, whole number only).