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Your letter should be handwritten, but it is acceptable to use address labels on the envelop. Using address labels greatly reduces the chance that letter will be lost in the mail.
a word processor will see a handwritten letter as a picture unless you run an optical character recognition program
An inquiry letter is a letter requesting informationrather than requesting an action or presenting a proposal.
No
You should include in the letter why you are requesting leave. You should also include in the letter when you intend on returning back to work.
I would not recommend a typed signature on any letter unless you are sending it electronically. In all cases, a physical letter should have the actual signature of the sender. The recipient of a letter of recommendation that has a typed 'signature' will not hold the recommendation in high regard. A photocopy of a signed letter is preferable to a typed signature.
Education
Writing a letter requesting goods can be simple. If requesting a sample of a product be formal but friendly. Compliment the company and simply ask for a free sample or perhaps a discounted price.
Begin with the respectful greeting, "Dear Sir or Madam:" and write what you are requesting.
A letter requesting an invoice should be written in professional business letter format. Be sure to make your request clearly and concisely and explain the need for an invoice.
Depends what is written IN the letter and if that is interesting
use your hand