Question

format of formal letter

Answer 1

address
date
sub
sir,

para 1
para 2
para 3
thanking you
yours truly

Answer 2

Sender's Address
leave a line
Date(6th march 2018)
leave a line
Reciever's address
leave a line
Sir/Madam,
Subject (Optional in the latest format)

Body of the letter (First paragraph introduction)
(second paragraph the cause of writing the letter)
(third paragraph closing)(Foreg: Kindly see through the matter. I will be highly obliged)

Thanking you,
Your's faithfully,
Your name.