Answer: firstly we need to know the format of formal letter which i am writing seperately so its easy to understand how to writw a letter in a better way.
Formal letter: Image result for what is format of a formal letter
1 What is the format of a formal letter? A formal letter comprises 6 elements: the Address (Sender's/Receiver's), Date, Salutation, Subject, Body Text & Ending.
what is difference in formal and informal letter?
Formal letter is usually written for official reasons. A formal letter, also known as a business letter, and it is written in a formal language with a specific structure and layout. An informal letter is a personal letter, you may want to ask for something, or communicate with a friend far away.
Explanation: By senders name
senders address
city state, zip code
Date:.......
Dear Principal,
please accept this letter as a requesting application the purpose of this letter is that all our students think that there should be special computer classes in our school as its a very important need to all of us. If u arrange special computer classes the students will get a big chance to learn and explore new knowledge about computerization as in our school students are taking computer as a non-serious subject they do not even complete there assignments on time and have a lot of difficulties to understand a single topic they take a lot of time to cover a topic and in this way if we take a look at this whole criticizing situation computer seems to be a boring and useless subject . so by arranging special computer classes students will get to know that what's actual computer what's the use of it how it works how it helps and how it is supporting our environment and those who want to select there subject as computer for their future will have fun to learn so this is all I wanted to discuss for a better future and results. I hope you will accept my request and will not node it and will think and work on it .Thanks for your consideration waiting for your response.
Your sincerely
Name
Signature.
Thanks a lot this is end and any other help u can ask me.