A book store is having a 30% off sale. Dairy of a wimpy kid books are now 6.30 each. What was the original price of the books

Answer:  " $ 9.00 " .
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The original price of the each book was:  " $ 9.00 " .
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Let "x" = the "original price" (in "dollars").

30% of "x"  = (0.30)x = (0.3)x .

"x − (0.3x) = 6.30 ; 

" 1x − 0.3x = 6.30 " ; 

  " (0.7)x = 6.3 " ; 

Divide each side of the equation by "(0.7)" ;
  to isolate "x" on one side of the equation; & to solve for "x" ;

 
  " (0.7)x / (0.7) = 6.3 / (0.7) " ;

to get:
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 →  x = 9 (dollars) 
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Answer:  " $ 9.00 " .
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The original price of each books was:  " $ 9.00 " .
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