CitiMortgage has a calculator on its Web site to help potential homebuyers determine what kind of mortgage they can afford.

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Rowe Price, according to an expense calculator on the Morningstar Web site.

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Twenty-First's Web site ( www.twenty-first.com) has a calculator to help with your decision.

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These devices can barely surf the Web and rarely feature more than the most basic apps (such as a calculator or a calendar).

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