55.06% is the change from 336 to 521
Calculation steps:
[( 521 - 336 ) ÷ 336] x 100 = 55.06%
Formula
Percentage change = [(521 - 336) / 336] x 100
Subtract the new number by the original number
521 - 336 = 185
185 ÷ 336 = 0.5505952380952381
0.5505952380952381 x 100 = 55.06%