1142.42% is the change from 66 to 820
Calculation steps:
[( 820 - 66 ) ÷ 66] x 100 = 1142.42%
Formula
Percentage change = [(820 - 66) / 66] x 100
Subtract the new number by the original number
820 - 66 = 754
754 ÷ 66 = 11.424242424242424
11.424242424242424 x 100 = 1142.42%