Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. A finance charge includes interest rates, origination fees, service fees, and late fees.

I'm no math whiz, but I know a calculator when I see one. Twitter users have started drawing a cute little calculator out of numbers and dashes, and there's a small chunk of space for several words.

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James Chen, CMT is an expert trader, investment adviser, and global market strategist. Samantha (Sam) Silberstein, CFP®, CSLP®, EA, is an experienced financial consultant. She has a demonstrated ...