"I get maybe a 100 call a day."

You can't be serious. "A 100 calls" - how can a professional writer think that that's right? "I get maybe a one hundred calls a day" - is that what the writer is wanting to write? Because that's exactly what the writer wrote. Either replace 100 with hundred, or jettison the a. I'm guessing the employee said "I get maybe a hundred calls a day", so why not write exactly that? This is from "Olympics are big business; and business is very good" in today's 24H Vancouver.