97.35% is the change from 264 to 521
Calculation steps:
[( 521 - 264 ) ÷ 264] x 100 = 97.35%
Formula
Percentage change = [(521 - 264) / 264] x 100
Subtract the new number by the original number
521 - 264 = 257
257 ÷ 264 = 0.9734848484848485
0.9734848484848485 x 100 = 97.35%