-39.98% is the change from 848 to 509
Calculation steps:
[( 509 - 848 ) ÷ 848] x 100 = -39.98%
Formula
Percentage change = [(509 - 848) / 848] x 100
Subtract the new number by the original number
509 - 848 = -339
-339 ÷ 848 = -0.39976415094339623
-0.39976415094339623 x 100 = -39.98%