To find the loss percent, follow these steps:

1. Determine the Cost Price (CP):

The selling price (SP) is \( N100 \), and the loss is \( N10 \). The cost price can be calculated as:
\[
\text{CP} = \text{SP} + \text{Loss}
\]
\[
\text{CP} = 100 + 10 = N110
\]

2. Calculate the Loss Percent:

The loss is \( N10 \), and the cost price is \( N110 \). The loss percent is calculated as:
\[
\text{Loss Percent} = \left(\frac{\text{Loss}}{\text{CP}}\right) \times 100\%
\]
\[
\text{Loss Percent} = \left(\frac{10}{110}\right) \times 100\%
\]
\[
\text{Loss Percent} = \frac{10 \times 100}{110} = \frac{1000}{110} \approx 9.09\%
\]

In fractional form:
\[
\frac{1000}{110} = 9 \frac{10}{110} = 9 \frac{1}{11} \%
\]


The loss percent is 9 \(\frac{1}{11}\)%.

The correct answer is A. 9 \(\frac{1}{11}\)%.