In theory, a positive NPV project should provide an increase in the value of a firm's shares.
NPV of new capital equipment = $50 million - $30 million = $20 million
Value of company prior to equipment purchase = 8,000,000 × $28.00 = $224,000,000
Value of company after new equipment project = $224 million + $20 million = $244 million
Price per share after new equipment project = $244 million / 8 million = $30.50
Note that in reality, changes in stock prices result from changes in expectations more than changes in NPV.