840% is the change from 50 to 470
Calculation steps:
[( 470 - 50 ) ÷ 50] x 100 = 840%
Formula
Percentage change = [(470 - 50) / 50] x 100
Subtract the new number by the original number
470 - 50 = 420
420 ÷ 50 = 8.4
8.4 x 100 = 840%
Example