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So, according to the given data if call duration was less than 2 seconds, then total call cost will be 0 currency units. If call duration was between 3 and 30 seconds, then total call cost will be where Rate Formulas is the amount of seconds in one minute that will be used while billing the calls, which which is 0,8 currency units regarding the presented data. If call duration was more than 30 seconds, then total call cost will be currency units.
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