Correct Answer: Option A

Explanation

To calculate the percentage change in quantity demanded, we use the formula:

\(\text{Percentage Change} = \frac{\text{New Quantity} - \text{Old Quantity}}{\text{Old Quantity}} \times 100\)

Old Quantity: \(12,000 \, \text{kg}\) (at N20 per kg)
 New Quantity: \(8,000 \, \text{kg}\) (at N30 per kg)

The change in quantity:
\(\text{Change} = 8,000 - 12,000 = -4,000 \, \text{kg}\)

\(\text{Percentage Change} = \frac{-4,000}{12,000} \times 100 = -33.33\%\)

The percentage change in quantity demanded is \(-33.33\%\). This indicates a decrease in quantity demanded.

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