1209.8% is the change from 51 to 668
Calculation steps:
[( 668 - 51 ) ÷ 51] x 100 = 1209.8%
Formula
Percentage change = [(668 - 51) / 51] x 100
Subtract the new number by the original number
668 - 51 = 617
617 ÷ 51 = 12.098039215686274
12.098039215686274 x 100 = 1209.8%