Volume Index In Marshall Is --------?

∑Qn(Po + Pn)/ ∑Qo (Po + Pn) X100

∑Qn(Qo + Qn)/∑Qn(Po + Pn) X100

∑Pn(Po + Pn)/ ∑Pn (Po + Pn)

∑Pn(Qo + Qn)/∑Pn

Volume Index In Marshall Is --------?

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