81.79% is the change from 335 to 609
Calculation steps:
[( 609 - 335 ) ÷ 335] x 100 = 81.79%
Formula
Percentage change = [(609 - 335) / 335] x 100
Subtract the new number by the original number
609 - 335 = 274
274 ÷ 335 = 0.817910447761194
0.817910447761194 x 100 = 81.79%