1247.37% is the change from 19 to 256
Calculation steps:
[( 256 - 19 ) ÷ 19] x 100 = 1247.37%
Formula
Percentage change = [(256 - 19) / 19] x 100
Subtract the new number by the original number
256 - 19 = 237
237 ÷ 19 = 12.473684210526315
12.473684210526315 x 100 = 1247.37%