Yesterday my mother asked me to buy some stamps. Stamps, in the land of TYM, are available in 3c, 9c, 11c, 17c and 21c denominations. For three types of stamp I was asked to buy eight of each. For the other two types of stamp, I was asked to buy nine of each. Unfortunately I forgot which I was supposed to buy eight of and which to buy nine of. Luckily my mother had given me the exact money required to buy the stamps, $5.00 and the shopkeeper was able to give me the correct stamps. Which stamps did I buy?

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