21.3% is the change from 507 to 615
Calculation steps:
[( 615 - 507 ) ÷ 507] x 100 = 21.3%
Formula
Percentage change = [(615 - 507) / 507] x 100
Subtract the new number by the original number
615 - 507 = 108
108 ÷ 507 = 0.21301775147928995
0.21301775147928995 x 100 = 21.3%