With reference to this job posting, I have several years experience within the Public Relations field, where responsibilities include but are not limited to preparing proposals/budgets for projects and co-coordinating same, as well as entering data into Excel for comparative analytical reports and invoicing records.
With these experiences, I propose to complete the task within your specified deadline at the proposed rate.
Should you choose to accept my proposal I am more than willing to commence working with you immediately.
I look forward to working with you.