-13.46% is the change from 312 to 270
Calculation steps:
[( 270 - 312 ) ÷ 312] x 100 = -13.46%
Formula
Percentage change = [(270 - 312) / 312] x 100
Subtract the new number by the original number
270 - 312 = -42
-42 ÷ 312 = -0.1346153846153846
-0.1346153846153846 x 100 = -13.46%