350% is the change from 200 to 900
Calculation steps:
[( 900 - 200 ) ÷ 200] x 100 = 350%
Formula
Percentage change = [(900 - 200) / 200] x 100
Subtract the new number by the original number
900 - 200 = 700
700 ÷ 200 = 3.5
3.5 x 100 = 350%
Example