-7.22% is the change from 970 to 900
Calculation steps:
[( 900 - 970 ) ÷ 970] x 100 = -7.22%
Formula
Percentage change = [(900 - 970) / 970] x 100
Subtract the new number by the original number
900 - 970 = -70
-70 ÷ 970 = -0.07216494845360824
-0.07216494845360824 x 100 = -7.22%