A correct formula (dropping all minus signs) for the calculation of the elasticity of demand between point Q1, P1 and point Q2, P2 is
A. [(P2? P1)/(P2 + P1)]/[(Q2? Q1)/(Q2 + Q1)].
B. [(P2? P1)/P1]/[(Q2? Q1)/Q1].
C. [(Q2? Q1)/(Q2 + Q1)]/[(P2? P1)/(P2 + P1)].
D. [(Q2? Q1)/Q2)]/[(P2? P1)/P2].
Answer: C
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