30.23% is the change from 215 to 280
Calculation steps:
[( 280 - 215 ) ÷ 215] x 100 = 30.23%
Formula
Percentage change = [(280 - 215) / 215] x 100
Subtract the new number by the original number
280 - 215 = 65
65 ÷ 215 = 0.3023255813953488
0.3023255813953488 x 100 = 30.23%