-38.85% is the change from 834 to 510
Calculation steps:
[( 510 - 834 ) ÷ 834] x 100 = -38.85%
Formula
Percentage change = [(510 - 834) / 834] x 100
Subtract the new number by the original number
510 - 834 = -324
-324 ÷ 834 = -0.38848920863309355
-0.38848920863309355 x 100 = -38.85%