-38.45% is the change from 840 to 517
Calculation steps:
[( 517 - 840 ) ÷ 840] x 100 = -38.45%
Formula
Percentage change = [(517 - 840) / 840] x 100
Subtract the new number by the original number
517 - 840 = -323
-323 ÷ 840 = -0.38452380952380955
-0.38452380952380955 x 100 = -38.45%