-86.75% is the change from 317 to 42
Calculation steps:
[( 42 - 317 ) ÷ 317] x 100 = -86.75%
Formula
Percentage change = [(42 - 317) / 317] x 100
Subtract the new number by the original number
42 - 317 = -275
-275 ÷ 317 = -0.8675078864353313
-0.8675078864353313 x 100 = -86.75%