The old/Original value of the book before 30% increase in price is $70
Let us assume the old price of book before30% increase be x
Then the new price of the book after 30% increase would be x+ 30% of x
Which can be simplified as x+ 0.30x
Which further can be simplified 1.30x
As we are provided with the new price of book, we have to equate the above linear equation with the new price of the book
1.30x = $91
To solve the equation we need to move 1.30 from left hand side to right hand side which would change from to
X= 91/1.30
X=$70
Hence the old value of the book before 30% increase in price is $70
Correct question is if 30% increase in price of a book and the new price of a book is $91.00. What was the original price of the book?
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