308.45% is the change from 71 to 290
Calculation steps:
[( 290 - 71 ) ÷ 71] x 100 = 308.45%
Formula
Percentage change = [(290 - 71) / 71] x 100
Subtract the new number by the original number
290 - 71 = 219
219 ÷ 71 = 3.084507042253521
3.084507042253521 x 100 = 308.45%