12.1% is the change from 281 to 315
Calculation steps:
[( 315 - 281 ) ÷ 281] x 100 = 12.1%
Formula
Percentage change = [(315 - 281) / 281] x 100
Subtract the new number by the original number
315 - 281 = 34
34 ÷ 281 = 0.12099644128113879
0.12099644128113879 x 100 = 12.1%