70.25% is the change from 511 to 870
Calculation steps:
[( 870 - 511 ) ÷ 511] x 100 = 70.25%
Formula
Percentage change = [(870 - 511) / 511] x 100
Subtract the new number by the original number
870 - 511 = 359
359 ÷ 511 = 0.7025440313111546
0.7025440313111546 x 100 = 70.25%