284.78% is the change from 138 to 531
Calculation steps:
[( 531 - 138 ) ÷ 138] x 100 = 284.78%
Formula
Percentage change = [(531 - 138) / 138] x 100
Subtract the new number by the original number
531 - 138 = 393
393 ÷ 138 = 2.847826086956522
2.847826086956522 x 100 = 284.78%