-92.54% is the change from 670 to 50
Calculation steps:
[( 50 - 670 ) ÷ 670] x 100 = -92.54%
Formula
Percentage change = [(50 - 670) / 670] x 100
Subtract the new number by the original number
50 - 670 = -620
-620 ÷ 670 = -0.9253731343283582
-0.9253731343283582 x 100 = -92.54%