-62.9% is the change from 849 to 315
Calculation steps:
[( 315 - 849 ) ÷ 849] x 100 = -62.9%
Formula
Percentage change = [(315 - 849) / 849] x 100
Subtract the new number by the original number
315 - 849 = -534
-534 ÷ 849 = -0.6289752650176679
-0.6289752650176679 x 100 = -62.9%