1215.69% is the change from 51 to 671
Calculation steps:
[( 671 - 51 ) ÷ 51] x 100 = 1215.69%
Formula
Percentage change = [(671 - 51) / 51] x 100
Subtract the new number by the original number
671 - 51 = 620
620 ÷ 51 = 12.156862745098039
12.156862745098039 x 100 = 1215.69%