65.4% is the change from 315 to 521
Calculation steps:
[( 521 - 315 ) ÷ 315] x 100 = 65.4%
Formula
Percentage change = [(521 - 315) / 315] x 100
Subtract the new number by the original number
521 - 315 = 206
206 ÷ 315 = 0.653968253968254
0.653968253968254 x 100 = 65.4%