To calculate the percentage loss, let's first determine the total cost price (CP) and the total selling price (SP) of the pencils.
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Total Cost Price (CP):
- Cost per pencil = 5 kobo
- Number of pencils = 6
\[ \text{Total CP} = 5 \text{ kobo/pencil} \times 6 \text{ pencils} = 30 \text{ kobo} \]
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Total Selling Price (SP):
- Selling price per pencil = 3 kobo
- Number of pencils = 6
\[ \text{Total SP} = 3 \text{ kobo/pencil} \times 6 \text{ pencils} = 18 \text{ kobo} \]
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Calculate Loss:
- Loss = Total CP - Total SP
\[ \text{Loss} = 30 \text{ kobo} - 18 \text{ kobo} = 12 \text{ kobo} \]
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Calculate Percentage Loss: \[ \text{Percentage Loss} = \left( \frac{\text{Loss}}{\text{Total CP}} \right) \times 100 \]
\[ \text{Percentage Loss} = \left( \frac{12 \text{ kobo}}{30 \text{ kobo}} \right) \times 100 \approx 40% \]
Therefore, the percentage loss is 40%.