100.99% is the change from 303 to 609
Calculation steps:
[( 609 - 303 ) ÷ 303] x 100 = 100.99%
Formula
Percentage change = [(609 - 303) / 303] x 100
Subtract the new number by the original number
609 - 303 = 306
306 ÷ 303 = 1.00990099009901
1.00990099009901 x 100 = 100.99%