abv calculation

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appleweld

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i made some pear wine with a finished abv of 11.3. in some of this wine we added pear flavored vodka to increase the abv and create a light brandy for an after dinner drink. the vodka added was 80 proof. we added 2, 3, and 4 oz to bottles and filled with the wine. the bottles hold 750 ml. what is the abv after adding the vodka?
 
By my calculations the 2 oz addition resulted in a final ABV of 13.6. The 3 oz addition a final ABV of 14.7. The 4 oz addition a final ABV of 15.8. Hopefully someone else will answer as well.
 
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