Is there a charge for printing the article?

Yes. If the article is accepted, the amount of 4,000,000 Rials will be received for the cost of printing.

Can I simultaneously send various manuscripts?

No. When you send a paper for peer review you must wait for the result. Once it is accepted and the peer review process is over, you can send another manuscript.

Is it OK to simultaneously send a paper to various journals?

No. This is against the codes of COPE. If one does so, his/her article will not be published. In case it is already published, the article will be retracted. Then the name of the author(s) will enter our blacklist and no manuscript will be ever accepted from the author(s).