-38.76% is the change from 836 to 512
Calculation steps:
[( 512 - 836 ) ÷ 836] x 100 = -38.76%
Formula
Percentage change = [(512 - 836) / 836] x 100
Subtract the new number by the original number
512 - 836 = -324
-324 ÷ 836 = -0.3875598086124402
-0.3875598086124402 x 100 = -38.76%