-80.2% is the change from 510 to 101
Calculation steps:
[( 101 - 510 ) ÷ 510] x 100 = -80.2%
Formula
Percentage change = [(101 - 510) / 510] x 100
Subtract the new number by the original number
101 - 510 = -409
-409 ÷ 510 = -0.8019607843137255
-0.8019607843137255 x 100 = -80.2%