What percentage is 400 of 700?

For finding percentage of a number, say, with respect to a number(or total), say, y, the general formula is:

x/y * 100

so, here in this case: x=400, y =700

so, the required percentage = (400/700) * 100 i.e. 400/7 = 57.143% (Rounded off to the third decimal place)