600% is the change from 13 to 91
Calculation steps:
[( 91 - 13 ) ÷ 13] x 100 = 600%
Formula
Percentage change = [(91 - 13) / 13] x 100
Subtract the new number by the original number
91 - 13 = 78
78 ÷ 13 = 6
6 x 100 = 600%
Example