400% is the change from 155 to 775
Calculation steps:
[( 775 - 155 ) ÷ 155] x 100 = 400%
Formula
Percentage change = [(775 - 155) / 155] x 100
Subtract the new number by the original number
775 - 155 = 620
620 ÷ 155 = 4
4 x 100 = 400%
Example