-91.21% is the change from 307 to 27
Calculation steps:
[( 27 - 307 ) ÷ 307] x 100 = -91.21%
Formula
Percentage change = [(27 - 307) / 307] x 100
Subtract the new number by the original number
27 - 307 = -280
-280 ÷ 307 = -0.9120521172638436
-0.9120521172638436 x 100 = -91.21%