66.34% is the change from 511 to 850
Calculation steps:
[( 850 - 511 ) ÷ 511] x 100 = 66.34%
Formula
Percentage change = [(850 - 511) / 511] x 100
Subtract the new number by the original number
850 - 511 = 339
339 ÷ 511 = 0.6634050880626223
0.6634050880626223 x 100 = 66.34%