I don't think there's a formula to calculated the share price when bonus and dividend is being given. It is the sentiment that affects the share price at that time.
When a rumour is going on that a company is will give its shareholders bonuses or good dividends, the price may start going up because everybody will be demanding for it. But expect the price to fall after the bonuses and dividends has been given.
3 for 1 means for every 3 units of shares, 1 will be added to it.
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