What is the journal entry if the owner of the company invests $1400 into a checking account for the business in exchange for 200 shares of common stock?

Do you know the par value of the common stock?

It looks like you are gone, but let me just give you the following examples. If the par value is $7.00 per share (200 shares at $7 = $1400):

Cash.....................................$1,400
Common Stock....................................$1,400

If the par value is, for example, $5.00 per share (200 shares at $5 - $1000):

Cash.....................................$1400
Common Stock....................................$1000
Additional paid in capital........................$ 400