-7.79% is the change from 642 to 592
Calculation steps:
[( 592 - 642 ) ÷ 642] x 100 = -7.79%
Formula
Percentage change = [(592 - 642) / 642] x 100
Subtract the new number by the original number
592 - 642 = -50
-50 ÷ 642 = -0.0778816199376947
-0.0778816199376947 x 100 = -7.79%