117.5% is the change from 400 to 870
Calculation steps:
[( 870 - 400 ) ÷ 400] x 100 = 117.5%
Formula
Percentage change = [(870 - 400) / 400] x 100
Subtract the new number by the original number
870 - 400 = 470
470 ÷ 400 = 1.175
1.175 x 100 = 117.5%
Example