540% is the change from 50 to 320
Calculation steps:
[( 320 - 50 ) ÷ 50] x 100 = 540%
Formula
Percentage change = [(320 - 50) / 50] x 100
Subtract the new number by the original number
320 - 50 = 270
270 ÷ 50 = 5.4
5.4 x 100 = 540%
Example