81.97% is the change from 305 to 555
Calculation steps:
[( 555 - 305 ) ÷ 305] x 100 = 81.97%
Formula
Percentage change = [(555 - 305) / 305] x 100
Subtract the new number by the original number
555 - 305 = 250
250 ÷ 305 = 0.819672131147541
0.819672131147541 x 100 = 81.97%