137.5% is the change from 400 to 950
Calculation steps:
[( 950 - 400 ) ÷ 400] x 100 = 137.5%
Formula
Percentage change = [(950 - 400) / 400] x 100
Subtract the new number by the original number
950 - 400 = 550
550 ÷ 400 = 1.375
1.375 x 100 = 137.5%
Example