-20.61% is the change from 660 to 524
Calculation steps:
[( 524 - 660 ) ÷ 660] x 100 = -20.61%
Formula
Percentage change = [(524 - 660) / 660] x 100
Subtract the new number by the original number
524 - 660 = -136
-136 ÷ 660 = -0.20606060606060606
-0.20606060606060606 x 100 = -20.61%