Bargain in Guavas

Recently I bought some guavas at New Market for  Rs. 1.20. 

But they were so small, I made the vendor to part with two extra guavas
for the same price. 

As I began to walk away, the vendor mumbled that this transaction 
had made him lose 10 paise a dozen less than the price settled before.

How many guavas did I get for Rs. 1.20?

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