1228% is the change from 50 to 664
Calculation steps:
[( 664 - 50 ) ÷ 50] x 100 = 1228%
Formula
Percentage change = [(664 - 50) / 50] x 100
Subtract the new number by the original number
664 - 50 = 614
614 ÷ 50 = 12.28
12.28 x 100 = 1228%
Example