Schweser on supernormal growth

Have you guys read the equity valuation reading, in the supernormal growth section (page 213), schweser shows a shortcut to calculate the last present value of infinite dividend growth. I have double checked the traditional method showed in the curriculum and what i have learn in class, the results were different. Schweser keeps using its method in the question bank. I doubt that the schweser method is wrong. Enlighten me please, everybody.

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