Sir,
Having examined the Invitation to Bid on this job and the job description, I offer to execute and complete such job in conformity with the terms and conditions of Contract, for the sum of $30USD only.
I have the necessary qualifications, work experiences and skills required to execute the job effectively and efficiently.
I proposed the idea of Facebook and Google advertorials.
We shall agree on the terms and conditions of the job and then I shall proceed to execution of the job. I expect your response and final award of the contract soon.
Best regards.