The owner of a stationery shop uses a special method to price the items which he sells in his shop. A pencil costs $36, ruler costs $30, pen costs $18 and a book costs $24.

How much does a notebook then cost?

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The owner of a stationery shop uses a special method to price the items which he sells in his shop. A pencil costs $36, ruler costs $30, pen costs $18 and a book costs $24.

How much does a notebook then cost?

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