Find the quotient (line over 42 is repeating) _ (0.42. divided by 2/9) a)84/891 b)189/100 c)21/11 d)21

 The correct answer is:  [C]:  "  " . 
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Explanation:
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Let us begin by converting the:  
"0.42 (with the "repeating bar on the digits, "42") " ;  

into a fraction, as follows:
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   Let  x = 0.42424242424242424242424242424242....

100x = 42.42424242424242424242424242424242....
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         100x = 42.42424242424242424242424242424242....
    –         x =   0.42424242424242424242424242424242...
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          99x = 42.000000000000000000000000000000.... ;

         →   99x = 42 ;  

Divide each side of the equation by " 99 " ;  
       to isolate "x" on one side of the equation; & to solve for "x" ; 
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         →  99x / 99 = 42/99 = (42 ÷ 3) / (99 ÷ 3) = 14/ 33; 

         →  x = "" .

So;  "0.42 (with a repeating bar over the digits, "42" ;

           is equal to:  "" 
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 So, rewrite the question/problem being asked:
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  "Find the quotient:  
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     ÷   ;

=   *   ;

Note:  The "14" cancels to a "7" ; and the "2" cancels to a "1" ; 
       →  {since:  " 14 ÷ 2 = 7 " ; and since:  " 2 ÷ 2 = 1 "} ;

Note : The "33" cancels to an "11" ; and the "9" cancels to a "3" ;
        →  {since:  " 33 ÷ 3 = 11 " ; and since:  " 9 ÷ 3 = 3 "} ;

And we can rewrite the problem as:
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 "  * "  ;

  =     =  ; 

            → which is:  Answer choice:  [C]:  "  " .
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Ithink it's b sorry if i'm wrong