283.97% is the change from 131 to 503
Calculation steps:
[( 503 - 131 ) ÷ 131] x 100 = 283.97%
Formula
Percentage change = [(503 - 131) / 131] x 100
Subtract the new number by the original number
503 - 131 = 372
372 ÷ 131 = 2.8396946564885495
2.8396946564885495 x 100 = 283.97%