67.54% is the change from 305 to 511
Calculation steps:
[( 511 - 305 ) ÷ 305] x 100 = 67.54%
Formula
Percentage change = [(511 - 305) / 305] x 100
Subtract the new number by the original number
511 - 305 = 206
206 ÷ 305 = 0.6754098360655738
0.6754098360655738 x 100 = 67.54%