256.2% is the change from 137 to 488
Calculation steps:
[( 488 - 137 ) ÷ 137] x 100 = 256.2%
Formula
Percentage change = [(488 - 137) / 137] x 100
Subtract the new number by the original number
488 - 137 = 351
351 ÷ 137 = 2.562043795620438
2.562043795620438 x 100 = 256.2%