Rainbow, that clearly requires one to factor in their personal holdings. If I hold 1 share of P, and 100000 of common, then that's one reality. If I hold 1 share of Commons, and 1000 shares of Ps, then it's a different reality.
Of course, that's an extreme example -- but it shows quickly why the math does not work universally. One has to calculate the effects for themselves, on their own holdings.
...Catz