68.44% is the change from 320 to 539
Calculation steps:
[( 539 - 320 ) ÷ 320] x 100 = 68.44%
Formula
Percentage change = [(539 - 320) / 320] x 100
Subtract the new number by the original number
539 - 320 = 219
219 ÷ 320 = 0.684375
0.684375 x 100 = 68.44%