-70.68% is the change from 307 to 90
Calculation steps:
[( 90 - 307 ) ÷ 307] x 100 = -70.68%
Formula
Percentage change = [(90 - 307) / 307] x 100
Subtract the new number by the original number
90 - 307 = -217
-217 ÷ 307 = -0.7068403908794788
-0.7068403908794788 x 100 = -70.68%