Estimate the intrinsic value of SmileWhite using the table above, and the two-s

Estimate the intrinsic value of SmileWhite using the table above, and the two-stage DDM. Dividends per share in 2012 were $2.50.
Recommend QuickBrush or SmileWhite stock for purchase by comparing each company’s intrinsic value with its current market price.
Describe one strength of the two-stage DDM in comparison with the constant growth DDM. Describe one weakness inherent in all DDMs.
I have completed some of the calculations. I do not know if I am on the right track. The spreadsheet is attached.

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