-23.24% is the change from 641 to 492
Calculation steps:
[( 492 - 641 ) ÷ 641] x 100 = -23.24%
Formula
Percentage change = [(492 - 641) / 641] x 100
Subtract the new number by the original number
492 - 641 = -149
-149 ÷ 641 = -0.23244929797191888
-0.23244929797191888 x 100 = -23.24%