Answer:
Given: \[{{Q}_{1}}=80\] units, \[{{Q}_{2}}=?\] \[{{P}_{1}}=\] Rs. 10/unit and \[{{P}_{2}}=\] Rs. 9/unit and \[{{E}_{s}}\] = 4 Let \[{{Q}_{2}}\] be \[x\] \[\Delta Q=({{Q}_{2}}-{{Q}_{1}})\] \[=(x-80)\] \[\Delta P=({{P}_{2}}-{{P}_{1}})\] \[=(910)\] \[=1\] \[{{E}_{s}}=(\Delta Q\div \Delta P)\,\times \,(P\div Q)\] \[4=(x-80\div (-1)\times (10\div 80)\] \[4=x\div 80\div 8\] \[-32=x-80\] \[x=\,48\] units Thus, a producer will supply 48 units at Rs. 9 per unit.
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