7.8% is the change from 615 to 663
Calculation steps:
[( 663 - 615 ) ÷ 615] x 100 = 7.8%
Formula
Percentage change = [(663 - 615) / 615] x 100
Subtract the new number by the original number
663 - 615 = 48
48 ÷ 615 = 0.07804878048780488
0.07804878048780488 x 100 = 7.8%