-50.36% is the change from 830 to 412
Calculation steps:
[( 412 - 830 ) ÷ 830] x 100 = -50.36%
Formula
Percentage change = [(412 - 830) / 830] x 100
Subtract the new number by the original number
412 - 830 = -418
-418 ÷ 830 = -0.5036144578313253
-0.5036144578313253 x 100 = -50.36%