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.$)$

$\backslash$table$[[\backslash$table$[[$Current market$],[$price per share$]],\backslash$table$[[$Dividend$],[$growth rate$]],\backslash$table$[[$Projected$],[$dividend per$],[$share next year$]],\backslash$table$[[$Underpricing$],[$per share$]],\backslash$table$[[$Flotation cost$],[$per share$]]],[$$$57\mathrm{.}00,7\%,$$$2\mathrm{.}85,$$$2\mathrm{.}50,$$$1\mathrm{.}50$