-5.71% is the change from 700 to 660
Calculation steps:
[( 660 - 700 ) ÷ 700] x 100 = -5.71%
Formula
Percentage change = [(660 - 700) / 700] x 100
Subtract the new number by the original number
660 - 700 = -40
-40 ÷ 700 = -0.05714285714285714
-0.05714285714285714 x 100 = -5.71%