64.05% is the change from 306 to 502
Calculation steps:
[( 502 - 306 ) ÷ 306] x 100 = 64.05%
Formula
Percentage change = [(502 - 306) / 306] x 100
Subtract the new number by the original number
502 - 306 = 196
196 ÷ 306 = 0.6405228758169934
0.6405228758169934 x 100 = 64.05%