-38.3% is the change from 825 to 509
Calculation steps:
[( 509 - 825 ) ÷ 825] x 100 = -38.3%
Formula
Percentage change = [(509 - 825) / 825] x 100
Subtract the new number by the original number
509 - 825 = -316
-316 ÷ 825 = -0.38303030303030305
-0.38303030303030305 x 100 = -38.3%