I am not the greatest when it comes to punctuation but I do know that when you talk about American currency you put the dollar sign ($) before you put the number. It’s something I learned a long time ago and its the proper way of writing it. Lately I have seen a trend of writing for example 200$ as in 200 dollars, it’s supposed to be $200. It might be a little thing but for those who are in writing, publishing and marketing that can make or break your business because details are actually a big thing if you are trying to win over clients and gain new business.