662.96% is the change from 81 to 618
Calculation steps:
[( 618 - 81 ) ÷ 81] x 100 = 662.96%
Formula
Percentage change = [(618 - 81) / 81] x 100
Subtract the new number by the original number
618 - 81 = 537
537 ÷ 81 = 6.62962962962963
6.62962962962963 x 100 = 662.96%