help please

A certain school budgeted N$ 13 777.50 for mathematics and history textbooks. 75 mathematics textbooks and 80 history textbooks must be bought. A history cost N$85.50. How much does a mathematics textbook cost?
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80 history books cost 80*85.50=6840. If we take this from the school budget we get 13777.50-6840=6937.50. If this is spent on 75 mathematics books, each one must cost 6937.50/75=N$92.50.

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