-71.43% is the change from 315 to 90
Calculation steps:
[( 90 - 315 ) ÷ 315] x 100 = -71.43%
Formula
Percentage change = [(90 - 315) / 315] x 100
Subtract the new number by the original number
90 - 315 = -225
-225 ÷ 315 = -0.7142857142857143
-0.7142857142857143 x 100 = -71.43%