53.11% is the change from 209 to 320
Calculation steps:
[( 320 - 209 ) ÷ 209] x 100 = 53.11%
Formula
Percentage change = [(320 - 209) / 209] x 100
Subtract the new number by the original number
320 - 209 = 111
111 ÷ 209 = 0.5311004784688995
0.5311004784688995 x 100 = 53.11%