19.07% is the change from 215 to 256
Calculation steps:
[( 256 - 215 ) ÷ 215] x 100 = 19.07%
Formula
Percentage change = [(256 - 215) / 215] x 100
Subtract the new number by the original number
256 - 215 = 41
41 ÷ 215 = 0.19069767441860466
0.19069767441860466 x 100 = 19.07%