Suppose Wesley Publishing's stock has a volatility of $55\%,$ while Addison Printing's stock has a volatility of $30\%.$ If the correlation between these stocks is $60\%,$ what is the volatility of the following portfolios of Addison and Wesley:

a$.100\%$ Addison

b$.75\%$ Addison and $25\%$ Wesley

c$.50\%$ Addison and $50\%$ Wesley

a$.$ The volatility of a portfolio of $100\%$ Addison stock is $\%.($Round to two decimal places.$)$