Bob's Gift Shop sold 500 cards for Mother's Day. One salesman, Camila, sold 10% of the cards sold for Mother's Day. How many cards did Camila sell?

To find out how many cards Camila sold, we need to calculate 10% of the total cards sold, which is 500.

10% can be calculated as follows:

\[ 10% \text{ of } 500 = \frac{10}{100} \times 500 = 0.10 \times 500 = 50 \]

So, Camila sold 50 cards for Mother's Day.