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Dear Mr. /Mrs. Last Name,
With reference to your advertisement in the New York Times I present myself for the post of the typist.
Sir, I have been working as a typist since last six months. My typing speed is around 28 words per minute. I have also won some of the major typing competition. The details are in my resume.
Sir, please consider my resume for the following post and fix some date, time as well as venue for the interview so that we can interact and believe me that you will definitely find me up to your expectation.
Thanks for taking the time to consider my application.

Sincerely,

Signature,

Typed name