87% is the change from 323 to 604
Calculation steps:
[( 604 - 323 ) ÷ 323] x 100 = 87%
Formula
Percentage change = [(604 - 323) / 323] x 100
Subtract the new number by the original number
604 - 323 = 281
281 ÷ 323 = 0.8699690402476781
0.8699690402476781 x 100 = 87%