The sales price of a book is obtained by adding [[$ 12% $]] VAT to the base price. The base price of a book that was sold at a price of [[$ 22.30 $]] QAR was reduced by [[$ 4.20 $]] QAR. What was the new sales price of the book? (Adapted from Finnish matriculation exam, autumn 1995)

Mark the original price with [[$ x $]] (QAR). In this case you get:



[[$ x ≈ $]] QAR

The reduced base price is


Reduced base price = QAR.

Therefore, the reduced sales price is



Answer: The new sales price of the book is QAR.