-17.45% is the change from 642 to 530
Calculation steps:
[( 530 - 642 ) ÷ 642] x 100 = -17.45%
Formula
Percentage change = [(530 - 642) / 642] x 100
Subtract the new number by the original number
530 - 642 = -112
-112 ÷ 642 = -0.17445482866043613
-0.17445482866043613 x 100 = -17.45%