-35.85% is the change from 491 to 315
Calculation steps:
[( 315 - 491 ) ÷ 491] x 100 = -35.85%
Formula
Percentage change = [(315 - 491) / 491] x 100
Subtract the new number by the original number
315 - 491 = -176
-176 ÷ 491 = -0.35845213849287166
-0.35845213849287166 x 100 = -35.85%