Explanation:

- To find the cost price of the rice mixture:

- 40 kg @ ?35/kg: Total = 40 × 35 = ?1,400

- 50 kg @ ?40/kg: Total = 50 × 40 = ?2,000

- Total cost = ?1,400 + ?2,000 = ?3,400

- Total quantity = 40 kg + 50 kg = 90 kg

- Cost price per kg = ?3,400 / 90 kg = ?37.78/kg

- To calculate the selling price for a 20% profit:

- 20% of ?37.78/kg = 0.20 × 37.78 = ?7.556

- Selling price per kg = ?37.78 + ?7.556 = ?45.336/kg

- Option 1: ?45.33/kg - This is the closest to the calculated value.

- Option 2: ?47.67/kg - Too high.

- Option 3: ?35.39/kg - Lower than cost price.

- Option 4: ?37.30/kg - Below cost price.

Correct Answer: Option 1 - ?45.33/kg.

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