A. ∑pn(Po + Pn)/ ∑pn (Po + Pn)
B. ∑qn(qo + qn)/∑qn(po + pn) x100
C. ∑pn(qo + qn)/∑pn
D. ∑qn(Po + Pn)/ ∑qo (Po + Pn) x100

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