-79.91% is the change from 428 to 86
Calculation steps:
[( 86 - 428 ) ÷ 428] x 100 = -79.91%
Formula
Percentage change = [(86 - 428) / 428] x 100
Subtract the new number by the original number
86 - 428 = -342
-342 ÷ 428 = -0.7990654205607477
-0.7990654205607477 x 100 = -79.91%