780% is the change from 50 to 440
Calculation steps:
[( 440 - 50 ) ÷ 50] x 100 = 780%
Formula
Percentage change = [(440 - 50) / 50] x 100
Subtract the new number by the original number
440 - 50 = 390
390 ÷ 50 = 7.8
7.8 x 100 = 780%
Example