-50.06% is the change from 841 to 420
Calculation steps:
[( 420 - 841 ) ÷ 841] x 100 = -50.06%
Formula
Percentage change = [(420 - 841) / 841] x 100
Subtract the new number by the original number
420 - 841 = -421
-421 ÷ 841 = -0.5005945303210464
-0.5005945303210464 x 100 = -50.06%