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The HP 12c financial calculator has all of the functions of a normal calculator plus additional functions for financial transactions. There are buttons to easily calculate loan amoritization, percent discounts, and sales tax.
It depends on if there are multiple copies of this card, and the year. It could range to an extra two dollars, to over a thousand. It all depends on the card. Search for the specific error card online to see if there are in fact more copies. The site you find it on should have specific money values for the card.
Some scientific calculators can't handle complex or imaginary numbers. If you happen to have a special calculator that does, probably the manual will tell you how to enter them.The HP 48 and up series does. It depends on if your calculator is in Polar Coordinate mode or X-Y coordinate mode, but a quick way to get the imaginary number i (regardless of which mode the calculator is currently in), is to press -1, then 'square root' button.