The stock of Company A gained $0.30 throughout the day and ended at a value of

$10.30. By what percentage did the stock rise?

It is 13 because of the explanation

The stock rose a 3 %

Step-by-step explanation:

If the stock gained $0.30 and ended at a value of $10.30, then its initial value was $10.30 - $0.30 = $10.

percentage increase = value gained/value at the start of the day * 100

percentage increase = 0.3/10 * 100 = 3%