Step 1: Understanding the Concept:
To determine the difference, we calculate the total earnings under both systems (contract and open market) over the entire 7-year period and compare them to find the profit or loss.
Key Formula or Approach:
- Total Earning (Existing) = \((\text{Total Castor} \times 45) + (\text{Total Cotton} \times 40)\)
- Total Earning (New) = \((\text{Total Castor} + \text{Total Cotton}) \times 43\)
- Net Difference = New Earning - Existing Earning
Step 2: Detailed Explanation:
Let us perform the calculations over the entire 7-year period (2011 to 2017):
- Total Castor = 1770 Kgs, Total Cotton = 1740 Kgs.
- Under the Existing Contract System:
\[ \text{Earning}_{\text{Castor}} = 1770 \times 45 = 79650\text{ Rs} \]
\[ \text{Earning}_{\text{Cotton}} = 1740 \times 40 = 69600\text{ Rs} \]
\[ \text{Total Existing Earning} = 79650 + 69600 = 149250\text{ Rs} \]
- Under the New Open Market System:
- Total quantity = \(1770 + 1740 = 3510\text{ Kgs}\).
- Rate = Rs. 43 per Kg.
\[ \text{Total New Earning} = 3510 \times 43 = 150930\text{ Rs} \]
- Calculating the Net Difference:
\[ \text{Net Difference} = 150930 - 149250 = 1680\text{ Rs} \]
Since the new earning is higher than the existing earning, the farmer will have a profit of Rs. 1680.
Step 3: Final Answer:
The farmer will have a Profit of Rs. 1680 (Option B).