Price elasticity is computed by

A. $${e_p} = \frac{{{P_1} - {P_2}}}{{{Q_1}}} \times \frac{{{P_1} + {P_2}}}{{{Q_2}}}$$

B. $${e_p} = \frac{{\frac{{{Q_2} - {Q_1}}}{{{Q_1}}}}}{{{P_1}}} \times 100$$

C. $${e_p} = \frac{{\frac{{{Q_2} - {Q_1}}}{{{Q_1}}}}}{{\frac{{{P_2} - {P_1}}}{{{P_1}}}}}$$

D. $${e_p} = \frac{{\frac{{{Q_2} - {Q_1}}}{{{Q_1}}}}}{{{\text{Product}}}} \times 100$$

Answer: Option C