-20.45% is the change from 660 to 525
Calculation steps:
[( 525 - 660 ) ÷ 660] x 100 = -20.45%
Formula
Percentage change = [(525 - 660) / 660] x 100
Subtract the new number by the original number
525 - 660 = -135
-135 ÷ 660 = -0.20454545454545456
-0.20454545454545456 x 100 = -20.45%