30.7% is the change from 215 to 281
Calculation steps:
[( 281 - 215 ) ÷ 215] x 100 = 30.7%
Formula
Percentage change = [(281 - 215) / 215] x 100
Subtract the new number by the original number
281 - 215 = 66
66 ÷ 215 = 0.30697674418604654
0.30697674418604654 x 100 = 30.7%