In February, Alec had 1,541 visitors to his website. In March, he had 1,383 visitors to his website. What is the percentage decrease of the number of visitors to Alec's website from February to March? If necessary, round to the nearest tenth of a percent.

To calculate the percentage decrease from February to March, you can use the formula:

\[ \text{Percentage Decrease} = \left( \frac{\text{old value} - \text{new value}}{\text{old value}} \right) \times 100 \]

In this case, the "old value" is the number of visitors in February (1,541), and the "new value" is the number of visitors in March (1,383).

Let's plug in the numbers:

1. Calculate the difference in visitors: \[ 1,541 - 1,383 = 158 \]

2. Now, use the difference to find the percentage decrease: \[ \text{Percentage Decrease} = \left( \frac{158}{1,541} \right) \times 100 \]

3. Now calculate the division: \[ \frac{158}{1,541} \approx 0.1023 \]

4. Now multiply by 100 to convert to a percentage: \[ 0.1023 \times 100 \approx 10.23 \]

5. Rounding to the nearest tenth of a percent, we get approximately: \[ 10.3% \]

Therefore, the correct answer is A. 10.3%.