-78.89% is the change from 270 to 57
Calculation steps:
[( 57 - 270 ) ÷ 270] x 100 = -78.89%
Formula
Percentage change = [(57 - 270) / 270] x 100
Subtract the new number by the original number
57 - 270 = -213
-213 ÷ 270 = -0.7888888888888889
-0.7888888888888889 x 100 = -78.89%