Answer:
July sales Given, August sales \[B={{\left[ \begin{align} & \begin{matrix} 10000 & 15000 & 20000 \\ \end{matrix} \\ & \begin{matrix} 15000 & 5000 & 25000 \\ \end{matrix} \\ \end{align} \right]}_{GurcharanSingh}}^{Ramkishan}\] (i) Combined sales in July and August for each farmer in each crop \[A+B=\left[ \begin{align} & 15000+10000\,\,\,\,10000+15000\,\,\,\,50000+20000 \\ & 45000+15000\,\,\,\,20000+5000\,\,\,\,\,\,25000+25000 \\ \end{align} \right]\] \[\begin{align} & \begin{matrix} \,\,\,\,\,\,\,\,\,\,Rice & \,\,\,Maize & \,\,Wheat \\ \end{matrix} \\ & =\left[ \begin{align} & \begin{matrix} 25000 & 25000 & 70000 \\ \end{matrix} \\ & \begin{matrix} 60000 & 25000 & 50000 \\ \end{matrix} \\ \end{align} \right] \\ \end{align}\] (ii) Given both farmers receive 1.5% profit on gross sales. \[\therefore \]Profit of each farmer in July \[=1.5%\] of \[A=\frac{1.5}{100}\times A=0.015\times A\] \[=0.015\left[ \begin{align} & \begin{matrix} 15000 & 10000 & 50000 \\ \end{matrix} \\ & \begin{matrix} 45000 & 20000 & 25000 \\ \end{matrix} \\ \end{align} \right]\] \[=\left[ \begin{align} & 15000\times 0.015\,\,\,\,10000\times 0.015\,\,\,\,50000\times 0.015 \\ & 45000\times 0.015\,\,\,\,20000\times 0.015\,\,\,\,25000\times 0.015 \\ \end{align} \right]\]\[={{\left[ \begin{align} & \begin{matrix} 225 & 150 & 750 \\ \end{matrix} \\ & \begin{matrix} 675 & 300 & 375 \\ \end{matrix} \\ \end{align} \right]}_{Gurcharan\,\,Singh}}^{Ramkishan}\] \[\therefore \]Ramkishan?s profit\[=225+150+750=Rs.\,\,1125\] and Gurcharan Singh?s profit \[=675+300+375=Rs.\,\,1350\] (iii) For saving environment (a) Farmers should use the process of crop-rotation (b) also they should use least amount of fertilisers and least water.
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