91.25% is the change from 320 to 612
Calculation steps:
[( 612 - 320 ) ÷ 320] x 100 = 91.25%
Formula
Percentage change = [(612 - 320) / 320] x 100
Subtract the new number by the original number
612 - 320 = 292
292 ÷ 320 = 0.9125
0.9125 x 100 = 91.25%