-87.01% is the change from 670 to 87
Calculation steps:
[( 87 - 670 ) ÷ 670] x 100 = -87.01%
Formula
Percentage change = [(87 - 670) / 670] x 100
Subtract the new number by the original number
87 - 670 = -583
-583 ÷ 670 = -0.8701492537313433
-0.8701492537313433 x 100 = -87.01%