53.75% is the change from 400 to 615
Calculation steps:
[( 615 - 400 ) ÷ 400] x 100 = 53.75%
Formula
Percentage change = [(615 - 400) / 400] x 100
Subtract the new number by the original number
615 - 400 = 215
215 ÷ 400 = 0.5375
0.5375 x 100 = 53.75%