-55.13% is the change from 936 to 420
Calculation steps:
[( 420 - 936 ) ÷ 936] x 100 = -55.13%
Formula
Percentage change = [(420 - 936) / 936] x 100
Subtract the new number by the original number
420 - 936 = -516
-516 ÷ 936 = -0.5512820512820513
-0.5512820512820513 x 100 = -55.13%