-36.51% is the change from 830 to 527
Calculation steps:
[( 527 - 830 ) ÷ 830] x 100 = -36.51%
Formula
Percentage change = [(527 - 830) / 830] x 100
Subtract the new number by the original number
527 - 830 = -303
-303 ÷ 830 = -0.3650602409638554
-0.3650602409638554 x 100 = -36.51%