100% is the change from 303 to 606
Calculation steps:
[( 606 - 303 ) ÷ 303] x 100 = 100%
Formula
Percentage change = [(606 - 303) / 303] x 100
Subtract the new number by the original number
606 - 303 = 303
303 ÷ 303 = 1
1 x 100 = 100%
Example