59.06% is the change from 320 to 509
Calculation steps:
[( 509 - 320 ) ÷ 320] x 100 = 59.06%
Formula
Percentage change = [(509 - 320) / 320] x 100
Subtract the new number by the original number
509 - 320 = 189
189 ÷ 320 = 0.590625
0.590625 x 100 = 59.06%