30.73% is the change from 615 to 804
Calculation steps:
[( 804 - 615 ) ÷ 615] x 100 = 30.73%
Formula
Percentage change = [(804 - 615) / 615] x 100
Subtract the new number by the original number
804 - 615 = 189
189 ÷ 615 = 0.3073170731707317
0.3073170731707317 x 100 = 30.73%