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Karon went to the post office and spent $31.57 on 84 stamps. She bought 27¢ stamps...

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Advance Math

Karon went to the post office and spent $31.57 on 84 stamps. Shebought 27¢ stamps for all the postcards, 42¢ stamps for each letteraddressed to friends in the U.S., and 94¢ stamps for each letter toEngland. Karon bought 7 times as many postcard stamps as those forthe letters to England. How many postcard stamps did Karon buy?(Hint: Use matrices.)

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