A shop sells books at 20% below the recommended retail price (r.r.p.). If it sells a book

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A shop sells books at ‘20% below the recommended retail price (r.r.p.)’. If it sells a book for $12.40, find
(a) The r.r.p.
(b) The cost of the book after a further reduction of 15% in a sale
(c) The overall percentage discount obtained by buying the book from the shop in the sale compared with the manufacturer’s r.r.p.

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