89.47% is the change from 323 to 612
Calculation steps:
[( 612 - 323 ) ÷ 323] x 100 = 89.47%
Formula
Percentage change = [(612 - 323) / 323] x 100
Subtract the new number by the original number
612 - 323 = 289
289 ÷ 323 = 0.8947368421052632
0.8947368421052632 x 100 = 89.47%