66.01% is the change from 509 to 845
Calculation steps:
[( 845 - 509 ) ÷ 509] x 100 = 66.01%
Formula
Percentage change = [(845 - 509) / 509] x 100
Subtract the new number by the original number
845 - 509 = 336
336 ÷ 509 = 0.6601178781925344
0.6601178781925344 x 100 = 66.01%