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No. Variable names are best kept as short as possible so long as they remain self-explanatory. The name "cost" alone implies an amount of some kind (usually currency but not always).
Also, if a name consists of more than one word, an underscore makes it more readable. E.g., "cost_amount" would be better than "costAmount", but "cost" alone would still be better.
It's also a good idea to put variable names in namespaces unless they are local variables or class members. That way you're less likely to end up with name-clashes in the global namespace.
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