-77.98% is the change from 645 to 142
Calculation steps:
[( 142 - 645 ) ÷ 645] x 100 = -77.98%
Formula
Percentage change = [(142 - 645) / 645] x 100
Subtract the new number by the original number
142 - 645 = -503
-503 ÷ 645 = -0.7798449612403101
-0.7798449612403101 x 100 = -77.98%