79.29% is the change from 507 to 909
Calculation steps:
[( 909 - 507 ) ÷ 507] x 100 = 79.29%
Formula
Percentage change = [(909 - 507) / 507] x 100
Subtract the new number by the original number
909 - 507 = 402
402 ÷ 507 = 0.7928994082840237
0.7928994082840237 x 100 = 79.29%