210% is the change from 200 to 620
Calculation steps:
[( 620 - 200 ) ÷ 200] x 100 = 210%
Formula
Percentage change = [(620 - 200) / 200] x 100
Subtract the new number by the original number
620 - 200 = 420
420 ÷ 200 = 2.1
2.1 x 100 = 210%
Example