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Number theory Difficulty 2.0 Junior Find the answer United Kingdom

David likes books. He only ever pays 99p or £1.99 for an electronic book. In the last few months he has spent £56.56 on electronic books. How many electronic books costing £1.99 has he bought in that time?

(A) $8$ (B) $13$ (C) $15$ (D) $17$ (E) $23$

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