A store marks a book 30% above the cost. But during a sale, a 10% discount was given. If the book costs $50, what is the percent profit?
A step-by-step solution is:
17
The store made a $50 x 30 / 100 = $15 profit for selling it 30% above the cost.

So, the book was sold for $50 + $15 = $65.

During a sale, the book’s selling price decreased by $65 x 10 / 100 = $6.

50.

So, the book was sold for $65 - $6.

50 = $58.

50.

There was $58.

50 - $50 = $8.

50 profit after the discount.

Therefore, the percent profit is $8.

50 / $50 x 100% = 17%.

.

Therefore, the answer is 17