-88.89% is the change from 630 to 70
Calculation steps:
[( 70 - 630 ) ÷ 630] x 100 = -88.89%
Formula
Percentage change = [(70 - 630) / 630] x 100
Subtract the new number by the original number
70 - 630 = -560
-560 ÷ 630 = -0.8888888888888888
-0.8888888888888888 x 100 = -88.89%