3572.22% is the change from 18 to 661
Calculation steps:
[( 661 - 18 ) ÷ 18] x 100 = 3572.22%
Formula
Percentage change = [(661 - 18) / 18] x 100
Subtract the new number by the original number
661 - 18 = 643
643 ÷ 18 = 35.72222222222222
35.72222222222222 x 100 = 3572.22%