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$.$ The cost of new common stock is$\%.($Round to two decimal places.$)$