Answer:
300%
Step-by-step explanation:
To find percent change we need to use this formula:

To find the amount of change we need to minus 50 from 200:
200 - 50 = 150
Now that we have the amount of change we can plug it in to the equation with the original amount (50):

Therefore, the percent of change is 300%.
I hope this helps!!
- Kay :)