Arbor Systems and Gencore stocks both have a volatility of 42%. Compute the volatility of a portfolio with 50% invested in each stock if the correlation between the stocks is (a) +1.00 , (b) 0.50 , (c) 0.00 , (d) -0.50 , and (e) -1.00 . In which of the cases is the volatility lower than that of the original stocks? If the correlation is +1.00 , the volatility of the portfolio is %. (Round to two decimal place.)