-23.66% is the change from 841 to 642
Calculation steps:
[( 642 - 841 ) ÷ 841] x 100 = -23.66%
Formula
Percentage change = [(642 - 841) / 841] x 100
Subtract the new number by the original number
642 - 841 = -199
-199 ÷ 841 = -0.23662306777645659
-0.23662306777645659 x 100 = -23.66%