538.46% is the change from 13 to 83
Calculation steps:
[( 83 - 13 ) ÷ 13] x 100 = 538.46%
Formula
Percentage change = [(83 - 13) / 13] x 100
Subtract the new number by the original number
83 - 13 = 70
70 ÷ 13 = 5.384615384615385
5.384615384615385 x 100 = 538.46%