80.9% is the change from 288 to 521
Calculation steps:
[( 521 - 288 ) ÷ 288] x 100 = 80.9%
Formula
Percentage change = [(521 - 288) / 288] x 100
Subtract the new number by the original number
521 - 288 = 233
233 ÷ 288 = 0.8090277777777778
0.8090277777777778 x 100 = 80.9%