-21.52% is the change from 841 to 660
Calculation steps:
[( 660 - 841 ) ÷ 841] x 100 = -21.52%
Formula
Percentage change = [(660 - 841) / 841] x 100
Subtract the new number by the original number
660 - 841 = -181
-181 ÷ 841 = -0.21521997621878716
-0.21521997621878716 x 100 = -21.52%