-86.5% is the change from 311 to 42
Calculation steps:
[( 42 - 311 ) ÷ 311] x 100 = -86.5%
Formula
Percentage change = [(42 - 311) / 311] x 100
Subtract the new number by the original number
42 - 311 = -269
-269 ÷ 311 = -0.864951768488746
-0.864951768488746 x 100 = -86.5%