Check out the format for Business Letter for SBI PO 2015.

SBI PO : BUSINESS LETTER FORMAT
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Address
Telephone Number
Email Address
Date
Recipient’s Name
Address
Dear Mr./Ms. (Recipient’s Full Name),
Subject: (PURPOSE OF THE LETTER)
In the 1st paragraph, you can introduce yourself, if the recipient of the letter doesn’t know you. After this, start mentioning the purpose of the letter.
In the second paragraph, explain all the details i.e., all the facts that support the statement you made in the 1st paragraph.
Now you can end the letter with this paragraph or you can add another one, if the information you want to convey does not fit in this paragraph.
Thanking You

Yours faithfully,
(Your Signature)
(Your Name)