-79.33% is the change from 421 to 87
Calculation steps:
[( 87 - 421 ) ÷ 421] x 100 = -79.33%
Formula
Percentage change = [(87 - 421) / 421] x 100
Subtract the new number by the original number
87 - 421 = -334
-334 ÷ 421 = -0.7933491686460807
-0.7933491686460807 x 100 = -79.33%