-90.91% is the change from 341 to 31
Calculation steps:
[( 31 - 341 ) ÷ 341] x 100 = -90.91%
Formula
Percentage change = [(31 - 341) / 341] x 100
Subtract the new number by the original number
31 - 341 = -310
-310 ÷ 341 = -0.9090909090909091
-0.9090909090909091 x 100 = -90.91%