6.3% is the change from 270 to 287
Calculation steps:
[( 287 - 270 ) ÷ 270] x 100 = 6.3%
Formula
Percentage change = [(287 - 270) / 270] x 100
Subtract the new number by the original number
287 - 270 = 17
17 ÷ 270 = 0.06296296296296296
0.06296296296296296 x 100 = 6.3%