21.12% is the change from 251 to 304
Calculation steps:
[( 304 - 251 ) ÷ 251] x 100 = 21.12%
Formula
Percentage change = [(304 - 251) / 251] x 100
Subtract the new number by the original number
304 - 251 = 53
53 ÷ 251 = 0.21115537848605578
0.21115537848605578 x 100 = 21.12%