Is the set of all discontinuous real-valued functions complete metric space?

I'm not to sure about this answer, it is kinda confusing to me. I sowwiieee, I tried to answer it though. :/

First we are going to find divided by 100 and multiply 20 is equal to four.

We are gonna use x to represent this number.

x/100 * 20 = 4

Solve for x

Therefore x = 20cm

Now that we found x the side of the larger square we are gonna find the area which is side^2.

20 * 20

Therefore the area of the larger square is 400cm^2