-87.9% is the change from 620 to 75
Calculation steps:
[( 75 - 620 ) ÷ 620] x 100 = -87.9%
Formula
Percentage change = [(75 - 620) / 620] x 100
Subtract the new number by the original number
75 - 620 = -545
-545 ÷ 620 = -0.8790322580645161
-0.8790322580645161 x 100 = -87.9%