67.87% is the change from 305 to 512
Calculation steps:
[( 512 - 305 ) ÷ 305] x 100 = 67.87%
Formula
Percentage change = [(512 - 305) / 305] x 100
Subtract the new number by the original number
512 - 305 = 207
207 ÷ 305 = 0.6786885245901639
0.6786885245901639 x 100 = 67.87%