a. Hocound to lase dectrat ciares) Retained earnings versus new common stock Using the data for a firm shown in the following table, calculate the cost of refained earnings and the cost of new common stock using the constant-growin valuation model. (Click on the icon here e in order to copy the contents of the data table below into a spreadeheet) a. The cost of retained earnings is 6. (Round to two decimal places.) b. The cost of new common stock is 5. (Round to two decimal places.)