-19.95% is the change from 802 to 642
Calculation steps:
[( 642 - 802 ) ÷ 802] x 100 = -19.95%
Formula
Percentage change = [(642 - 802) / 802] x 100
Subtract the new number by the original number
642 - 802 = -160
-160 ÷ 802 = -0.19950124688279303
-0.19950124688279303 x 100 = -19.95%