300% is the change from 50 to 200
Calculation steps:
[( 200 - 50 ) ÷ 50] x 100 = 300%
Formula
Percentage change = [(200 - 50) / 50] x 100
Subtract the new number by the original number
200 - 50 = 150
150 ÷ 50 = 3
3 x 100 = 300%
Example