-57.88% is the change from 641 to 270
Calculation steps:
[( 270 - 641 ) ÷ 641] x 100 = -57.88%
Formula
Percentage change = [(270 - 641) / 641] x 100
Subtract the new number by the original number
270 - 641 = -371
-371 ÷ 641 = -0.5787831513260531
-0.5787831513260531 x 100 = -57.88%