The total annual sales of a book in either paper or electronic form are 3500. Each paper
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The total annual sales of a book in either paper or electronic form are 3500. Each paper copy of the book costs $30 and each e-book costs $25. The total cost is $97 500.
(a) If x and y denote the number of copies in paper and electronic form, write down a pair of simultaneous equations.
(b) Solve the equations to find the number of e-books sold.
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a xy 3500 30x25y 975...View the full answer
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