I'm not the original poster but I googled this question and found it on the following website:
https://www.platinumgmat.com/about_gmat/ps_techniques
https://www.platinumgmat.com/about_gmat/ps_techniques
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Cramya,
I just browsed through the forum and saw this thread. I have not posted this question. But, when i got too confused, i thought that i shall take help from the experts. I tried by two or three methods but every time i got the same answer of 17.8 which is not thr in any of the answer choices. So, i thought let me double chk with all the experts if my reasoning or concepts are flawed..