100% is the change from 202 to 404
Calculation steps:
[( 404 - 202 ) ÷ 202] x 100 = 100%
Formula
Percentage change = [(404 - 202) / 202] x 100
Subtract the new number by the original number
404 - 202 = 202
202 ÷ 202 = 1
1 x 100 = 100%
Example