-87.65% is the change from 405 to 50
Calculation steps:
[( 50 - 405 ) ÷ 405] x 100 = -87.65%
Formula
Percentage change = [(50 - 405) / 405] x 100
Subtract the new number by the original number
50 - 405 = -355
-355 ÷ 405 = -0.8765432098765432
-0.8765432098765432 x 100 = -87.65%