Expiration of the amount on the card

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A certain telecom company issues calling cards of various denominations and types. The customer can buy a card and use them to make a call. The card can be renewed on expiration of the amount on the card. A customer can have more than one card in his account. The call duration, the card used for the call , the time of call are recorded. Review the data model below and answer the following questions

Reference no: EM133023318

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