-82.84% is the change from 670 to 115
Calculation steps:
[( 115 - 670 ) ÷ 670] x 100 = -82.84%
Formula
Percentage change = [(115 - 670) / 670] x 100
Subtract the new number by the original number
115 - 670 = -555
-555 ÷ 670 = -0.8283582089552238
-0.8283582089552238 x 100 = -82.84%