-30.23% is the change from 387 to 270
Calculation steps:
[( 270 - 387 ) ÷ 387] x 100 = -30.23%
Formula
Percentage change = [(270 - 387) / 387] x 100
Subtract the new number by the original number
270 - 387 = -117
-117 ÷ 387 = -0.3023255813953488
-0.3023255813953488 x 100 = -30.23%