Please help I am taking a test now. Need answers asap!

Based on the information below, what is firm's optimal capital structure? Debt = 40%i Equity = 60%; EPS = $2.95; Stock price = $26.50. Debt = 70%; Equity = 30%; EPS = $3.31; Stock price = $30.00. Debt = 80%; Equity = 20%; EPS = $3.42; Stock price = $30.40. Debt = 60%; Equity = 40%; EPS = $3.18; Stock price = $31.20. Debt = 50%; Equity = 50%; EPS = $3.05; Stock price = $28.90