-60% is the change from 670 to 268
Calculation steps:
[( 268 - 670 ) ÷ 670] x 100 = -60%
Formula
Percentage change = [(268 - 670) / 670] x 100
Subtract the new number by the original number
268 - 670 = -402
-402 ÷ 670 = -0.6
-0.6 x 100 = -60%
Example