I would like to use toFixed(2) to format some decimal numbers, but i think the type of my variable isnt correct for it.

step = parseFloat( data.MinimumOrder );
                
console.log(typeof step);

For that, typeof returns number.

For this, it returns string, and the toFixed(2) function wont do anything.

step = parseFloat( data.MinimumOrder ) . toFixed(2);

data.MinimumOrder can be 187.555 and 225.425.

What am i doing wrong?