-38.57% is the change from 840 to 516
Calculation steps:
[( 516 - 840 ) ÷ 840] x 100 = -38.57%
Formula
Percentage change = [(516 - 840) / 840] x 100
Subtract the new number by the original number
516 - 840 = -324
-324 ÷ 840 = -0.38571428571428573
-0.38571428571428573 x 100 = -38.57%