71.05% is the change from 304 to 520
Calculation steps:
[( 520 - 304 ) ÷ 304] x 100 = 71.05%
Formula
Percentage change = [(520 - 304) / 304] x 100
Subtract the new number by the original number
520 - 304 = 216
216 ÷ 304 = 0.7105263157894737
0.7105263157894737 x 100 = 71.05%