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yeah i figured something was wrong thats why the result seemed kinda right. But i have to agree with Waldo, questions that are constructed in a way that give you 2 different answers are lacking some...

I tryed it, i understand how you get 12.32 so i was trying to figure out how you get 5.13, i got something close but not 5.13 i got 5.32, maybe its a typo or maybe im wrong, either way consider this....