74% is the change from 500 to 870
Calculation steps:
[( 870 - 500 ) ÷ 500] x 100 = 74%
Formula
Percentage change = [(870 - 500) / 500] x 100
Subtract the new number by the original number
870 - 500 = 370
370 ÷ 500 = 0.74
0.74 x 100 = 74%
Example