Retained earnings versus new common stock. Using the data for a firm shown in the following table, calculate the cost of retained earnings and the cost of new common stock using the constant$-$growth

valuation model. $($Click on the icon here in order to copy the contents of the data table below into a spreadsheet.$)$

a$.$ The cost of retained earnings is $\%.($Round to two decimal places.$)$

b$.$ cost of new common stock is