74.38% is the change from 320 to 558
Calculation steps:
[( 558 - 320 ) ÷ 320] x 100 = 74.38%
Formula
Percentage change = [(558 - 320) / 320] x 100
Subtract the new number by the original number
558 - 320 = 238
238 ÷ 320 = 0.74375
0.74375 x 100 = 74.38%