66.6% is the change from 509 to 848
Calculation steps:
[( 848 - 509 ) ÷ 509] x 100 = 66.6%
Formula
Percentage change = [(848 - 509) / 509] x 100
Subtract the new number by the original number
848 - 509 = 339
339 ÷ 509 = 0.6660117878192534
0.6660117878192534 x 100 = 66.6%