-2.53% is the change from 277 to 270
Calculation steps:
[( 270 - 277 ) ÷ 277] x 100 = -2.53%
Formula
Percentage change = [(270 - 277) / 277] x 100
Subtract the new number by the original number
270 - 277 = -7
-7 ÷ 277 = -0.02527075812274368
-0.02527075812274368 x 100 = -2.53%