Looking for a formula to figure correct percentage?

A pie is split into four. 30%, 30%, 20% and 20%. One 20% piece isnt taken and must be divided proportionally to the remaining 30%, 30% and 20% holde

A pie is split into four. 30%, 30%, 20% and 20%. One 20% piece isn't taken and must be divided proportionally to the remaining 30%, 30% and 20% holders. What formula can be used to figure an amount the remaining 20% should be divided?

or:A pie is split into four. 30%, 30%, 20% and 20%. One 20% piece isn't taken and must be divided proportionally to the remaining 30%, 30% and 20% holders. What formula can be used to figure an amount the remaining 20% should be divided?

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