-49.19% is the change from 620 to 315
Calculation steps:
[( 315 - 620 ) ÷ 620] x 100 = -49.19%
Formula
Percentage change = [(315 - 620) / 620] x 100
Subtract the new number by the original number
315 - 620 = -305
-305 ÷ 620 = -0.49193548387096775
-0.49193548387096775 x 100 = -49.19%