-82.17% is the change from 830 to 148
Calculation steps:
[( 148 - 830 ) ÷ 830] x 100 = -82.17%
Formula
Percentage change = [(148 - 830) / 830] x 100
Subtract the new number by the original number
148 - 830 = -682
-682 ÷ 830 = -0.8216867469879519
-0.8216867469879519 x 100 = -82.17%