280.29% is the change from 137 to 521
Calculation steps:
[( 521 - 137 ) ÷ 137] x 100 = 280.29%
Formula
Percentage change = [(521 - 137) / 137] x 100
Subtract the new number by the original number
521 - 137 = 384
384 ÷ 137 = 2.802919708029197
2.802919708029197 x 100 = 280.29%