-38.8% is the change from 835 to 511
Calculation steps:
[( 511 - 835 ) ÷ 835] x 100 = -38.8%
Formula
Percentage change = [(511 - 835) / 835] x 100
Subtract the new number by the original number
511 - 835 = -324
-324 ÷ 835 = -0.38802395209580837
-0.38802395209580837 x 100 = -38.8%