814.29% is the change from 7 to 64
Calculation steps:
[( 64 - 7 ) ÷ 7] x 100 = 814.29%
Formula
Percentage change = [(64 - 7) / 7] x 100
Subtract the new number by the original number
64 - 7 = 57
57 ÷ 7 = 8.142857142857142
8.142857142857142 x 100 = 814.29%