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Source: — Data Sufficiency |
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by chidcguy » Mon Jun 02, 2008 10:25 am
10th's digit of 10d is nothing but hundredths digit of d, which is 7

thousandths digit of d/10 is nothing but hundredths digit of d, which is 7

Hence D

the concept that is tested is

(1) If you multiply a decimal by 10, digits after the . will shift towards the left for each multiplication by 10

(2) If you divide by 10, digits after the . will shift towards the right for each division by 10

Please post the answer in spoiler (see the spolier tag above beneath Subject) so that people can see the answer after they solve it.
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