I am not a new freelance provider, but I am new to this platform. My bid is based on an audition of sorts, which will provide me with some feedback, and you with the chance to look over my work and see if it is a good fit for your needs. I have based this on your offer of $2/500 words, with a total of 15 articles for $30 and $5 for the freelancer fees. If you like what I have to offer from this, I will gladly sign on for additional work at this rate. Please see my portfolio for samples of past work. I cannot complete a trial task for free, as I have been submitting more and more free work to potential employers without anything in return. This isn't to say that you are not a legitimate employer, as I have amended my bidding style towards those qualified and verified listings, but to protect both of us, this bid is for such a sample, with the rate as you stated in the project description.
If you would like to offer me this job, I can start now and complete the 15 articles within 4-5 days. Thank you!