-60.62% is the change from 800 to 315
Calculation steps:
[( 315 - 800 ) ÷ 800] x 100 = -60.62%
Formula
Percentage change = [(315 - 800) / 800] x 100
Subtract the new number by the original number
315 - 800 = -485
-485 ÷ 800 = -0.60625
-0.60625 x 100 = -60.62%