1. One yuan is equal to 10角.
2. When discussing 1 yuan and 2角, we can convert the 1 yuan to 10角 and then add the additional 2角.
3. Therefore, 1 yuan and 2角 is equivalent to 10角 plus 2角, which is 12角.
4. In conclusion, 1 yuan and 2角 is equal to 12角.
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