Answer:
Given, \[{{Q}_{1}}=30,{{Q}_{2}}=?,{{P}_{1}}=Rs\,\,10,\,\,{{P}_{2}}=\,Rs\,\,9\] and \[{{E}_{d}}=-1\] Therefore, \[\Delta Q={{Q}_{2}}-{{Q}_{1}}\] and \[\Delta P={{P}_{2}}-{{P}_{1}}=\,\,Rs\,\,(-1)\] \[{{E}_{d}}=\frac{\Delta Q}{Q}\,\,\times \,\,\frac{P}{Q}\] \[-1=\frac{({{Q}_{2}}-{{Q}_{1)}}}{30}\,\,\times \,\,\frac{{{P}_{1}}}{\Delta P}\] \[-1=\frac{({{Q}_{2}}-30)}{30}\,\,\times \,\,\frac{10}{(-1)}\] \[3={{Q}_{2}}-30\] \[{{Q}_{2}}=33\,\,units\] Therefore, the consumer will buy 33 units of the good at a price of Rs. 9.
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