A bookstore sells a novel for $4.50. The percent discount is 25%. Find the novel's sale
price. Round to nearest cent if necessary.

The answer is $3.38.  To get this answer you take the $4.50 and subtract 25 percent since it is a discount.  The discount for the book is $1.125.  So $4.50 minus $1.125 is $3.375.  We need to round to the nearest cent.  Since the number after 7 is 5 or greater, we round up to the nearest cent.  So $3.38 is the new cost of the book after the 25 % discount.  

5x+2x=49

7x=49

x=7. 35 apples