Interest rate swap

I can across this question but I’m unsure of the answer.

A corporation has issued $5 million of floating rate bonds on which it pays an interest rate 1% over the Libor rate. The bonds are selling at par value. The firm is worried that rates might rise, and it would like to lock in a fixed interest rate on its borrowings. The firm sees that dealers in the swap market are offering swaps of Libor for 4%. What swap arrangement will convert the firm’s borrowings to a synthetic fixed-rate loan? What interest rate will be paid?

The answer said; " the firm should enter a swap in which it pays a 4% fixed rate and receives Libor on $5 million of notional principal. It’s total payments are as follows;

interest payments on bond: (Libor + 1%) x 5 million

net cash flow from swap: (4% - Libor) x 5 million

total: 5% x 5 million

Why is the net cash flow not (Libor-4%) ? Aren’t you receiving Libor, so then why would it be negative?

Yes you’re receiving Libor, therefore you won’t be paying Libor after net cash flows. What are you referring to as “negative”?

Easier to understand it this way: the firm wants to lock in fixed rates = it doesn’t want to pay floating rates. (Libor - 4%) has Libor in it and therefore is floating! (and not the answer)

The firm original interest: Libor + 1%

When the firm enters the swap,

Pay swap: 4% fixed

Receive swap: Libor

The fixed rates after swap = - original - pay swap + receive swap = -(Libor +1) - 4 + Libor = -5% (negative 5% means paying 5% interest, positive means you earn/receive interest)