6.83% is the change from 615 to 657
Calculation steps:
[( 657 - 615 ) ÷ 615] x 100 = 6.83%
Formula
Percentage change = [(657 - 615) / 615] x 100
Subtract the new number by the original number
657 - 615 = 42
42 ÷ 615 = 0.06829268292682927
0.06829268292682927 x 100 = 6.83%