69.92% is the change from 512 to 870
Calculation steps:
[( 870 - 512 ) ÷ 512] x 100 = 69.92%
Formula
Percentage change = [(870 - 512) / 512] x 100
Subtract the new number by the original number
870 - 512 = 358
358 ÷ 512 = 0.69921875
0.69921875 x 100 = 69.92%