14.31% is the change from 538 to 615
Calculation steps:
[( 615 - 538 ) ÷ 538] x 100 = 14.31%
Formula
Percentage change = [(615 - 538) / 538] x 100
Subtract the new number by the original number
615 - 538 = 77
77 ÷ 538 = 0.14312267657992564
0.14312267657992564 x 100 = 14.31%