Interest compounded

thanks

Here's a website that may help you:

Continuously Compounded Interest Formula and Calculator

There is a slight ambiguity in your question. In the case of quarterly compounding, it's not clear whether the $300 was withdrawn before or after the compounding date. If "so many months ago" is calculated from today (Pearl Harbor Day, 12/7) then the compounding would be calculated before the $300 withdrawal and you'd have a few dollars more.