Answer:
Given, \[{{Q}_{1}}=16\] \[{{Q}_{2}}=18\] \[\Delta P=-1\] We know, \[\Delta Q={{Q}_{2}}-{{Q}_{1}}=1816=2\] \[{{E}_{d}}=\frac{\Delta Q}{Q}\,\,\times \,\,\frac{P}{\Delta P}\] \[-1=\frac{2}{16}\,\,\times \,\,\frac{P}{(-1)}\] \[-1=\frac{(-P)}{8}\] \[P=8\] Therefore, price before change is Rs. 8
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