64.71% is the change from 306 to 504
Calculation steps:
[( 504 - 306 ) ÷ 306] x 100 = 64.71%
Formula
Percentage change = [(504 - 306) / 306] x 100
Subtract the new number by the original number
504 - 306 = 198
198 ÷ 306 = 0.6470588235294118
0.6470588235294118 x 100 = 64.71%