-92.56% is the change from 309 to 23
Calculation steps:
[( 23 - 309 ) ÷ 309] x 100 = -92.56%
Formula
Percentage change = [(23 - 309) / 309] x 100
Subtract the new number by the original number
23 - 309 = -286
-286 ÷ 309 = -0.9255663430420712
-0.9255663430420712 x 100 = -92.56%