1240% is the change from 50 to 670
Calculation steps:
[( 670 - 50 ) ÷ 50] x 100 = 1240%
Formula
Percentage change = [(670 - 50) / 50] x 100
Subtract the new number by the original number
670 - 50 = 620
620 ÷ 50 = 12.4
12.4 x 100 = 1240%
Example