66900% is the change from 1 to 670
Calculation steps:
[( 670 - 1 ) ÷ 1] x 100 = 66900%
Formula
Percentage change = [(670 - 1) / 1] x 100
Subtract the new number by the original number
670 - 1 = 669
669 ÷ 1 = 669
669 x 100 = 66900%
Example