-89.86% is the change from 690 to 70
Calculation steps:
[( 70 - 690 ) ÷ 690] x 100 = -89.86%
Formula
Percentage change = [(70 - 690) / 690] x 100
Subtract the new number by the original number
70 - 690 = -620
-620 ÷ 690 = -0.8985507246376812
-0.8985507246376812 x 100 = -89.86%