Rockwood Industries has 100 million shares outstanding, a current share price of $25, and no debt. Rockwood's management

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Rockwood Industries has 100 million shares outstanding, a
current share price of $25, and no debt. Rockwood's management
believes that the shares are underpriced, and that the true value
is $30 per share. Rockwood plans to pay $250 million in cash to its
shareholders by repurchasing shares. Management expects that very
soon new information will come out that will cause investors to
revise their opinion of the firm and agree with Rockwood's
assessment of the firm's true value.
Assume that Rockwood is able to repurchase shares prior to
the market becoming aware of the new information regarding
Rockwood's true value.
Assume that Rockwood is not able to repurchase shares prior to
the market becoming aware of the new information regarding
Rockwood's true value.
Please answer i detail and giving explanations