50.72% is the change from 209 to 315
Calculation steps:
[( 315 - 209 ) ÷ 209] x 100 = 50.72%
Formula
Percentage change = [(315 - 209) / 209] x 100
Subtract the new number by the original number
315 - 209 = 106
106 ÷ 209 = 0.507177033492823
0.507177033492823 x 100 = 50.72%