50% is the change from 304 to 456
Calculation steps:
[( 456 - 304 ) ÷ 304] x 100 = 50%
Formula
Percentage change = [(456 - 304) / 304] x 100
Subtract the new number by the original number
456 - 304 = 152
152 ÷ 304 = 0.5
0.5 x 100 = 50%
Example