67.81% is the change from 320 to 537
Calculation steps:
[( 537 - 320 ) ÷ 320] x 100 = 67.81%
Formula
Percentage change = [(537 - 320) / 320] x 100
Subtract the new number by the original number
537 - 320 = 217
217 ÷ 320 = 0.678125
0.678125 x 100 = 67.81%