-81.5% is the change from 800 to 148
Calculation steps:
[( 148 - 800 ) ÷ 800] x 100 = -81.5%
Formula
Percentage change = [(148 - 800) / 800] x 100
Subtract the new number by the original number
148 - 800 = -652
-652 ÷ 800 = -0.815
-0.815 x 100 = -81.5%