810.1% is the change from 99 to 901
Calculation steps:
[( 901 - 99 ) ÷ 99] x 100 = 810.1%
Formula
Percentage change = [(901 - 99) / 99] x 100
Subtract the new number by the original number
901 - 99 = 802
802 ÷ 99 = 8.1010101010101
8.1010101010101 x 100 = 810.1%