-12.05% is the change from 307 to 270
Calculation steps:
[( 270 - 307 ) ÷ 307] x 100 = -12.05%
Formula
Percentage change = [(270 - 307) / 307] x 100
Subtract the new number by the original number
270 - 307 = -37
-37 ÷ 307 = -0.12052117263843648
-0.12052117263843648 x 100 = -12.05%