You invested $2,300 in a stock. your account now has a value of $2,643. your percentage gain on the investment (rounded to the nearest percent) was

2,643 - 2,300=343
343 divide 2,300= 0.1491304348
When rounded to the nearest percent
15%
Just remember that when finding percent change subtract the bigger no. From the smaller no. Then divide the answer by the original amount.

I hope this helps you :)