50% is the change from 612 to 918
Calculation steps:
[( 918 - 612 ) ÷ 612] x 100 = 50%
Formula
Percentage change = [(918 - 612) / 612] x 100
Subtract the new number by the original number
918 - 612 = 306
306 ÷ 612 = 0.5
0.5 x 100 = 50%
Example