Original price of a book: $18.50 Discount: 45%
18.5-45%=10.175 Hope this helped! :)
Find 45% of $18.50.45 ÷ 100 = 0.4518.50 × 0.45 = 8.32518.50 - 8.325 = 10.175 ≈ 10.2After the discount the book is $10.175 and when you round it it is $10.20.