264.49% is the change from 138 to 503
Calculation steps:
[( 503 - 138 ) ÷ 138] x 100 = 264.49%
Formula
Percentage change = [(503 - 138) / 138] x 100
Subtract the new number by the original number
503 - 138 = 365
365 ÷ 138 = 2.6449275362318843
2.6449275362318843 x 100 = 264.49%