168% is the change from 250 to 670
Calculation steps:
[( 670 - 250 ) ÷ 250] x 100 = 168%
Formula
Percentage change = [(670 - 250) / 250] x 100
Subtract the new number by the original number
670 - 250 = 420
420 ÷ 250 = 1.68
1.68 x 100 = 168%
Example