A retirement calculator is used to calculate how much money you will receive monthly as a payment, show's how much your home is worth, and also helps you establish if your ready for retirement.
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Calculators are used to calculate, or solve math problems to come up with solutions.Hope that helped!
Silicon based semiconductors are the most commonly used semiconductor material in calculators. Silicon semiconductors are also extensively used in computers.
They used the abacus
Mercury is a heavy metal that is very toxic and is a liquid at room temperature. For this reason I do not believe that there would be any mercury in calculators. I do not know why mercury would be used in manufacturing. I don't believe is is commonly used in computer chips. Whether or not mercury is actually used in calculators or in manufacturing of calculators depends varies by manufacturer.
There are several good retirement or fidelity calculators available, some of these are offered by well known names and sites. Some of these would be: Boulevard R, CNN Fortune and Money, T. Rowe Price, Fidelity, Bloomberg, Yahoo Finance, Stock Point and Nationwide.