60.47% is the change from 511 to 820
Calculation steps:
[( 820 - 511 ) ÷ 511] x 100 = 60.47%
Formula
Percentage change = [(820 - 511) / 511] x 100
Subtract the new number by the original number
820 - 511 = 309
309 ÷ 511 = 0.6046966731898239
0.6046966731898239 x 100 = 60.47%