Final answer:
Harry's final cost for the ream of computer paper is $4.53, after applying a 10% discount, adding a 6% sales tax, and subtracting a $5.00 mail-in rebate.
Step-by-step explanation:
Harry buys the computer paper with a starting price of $9.99 and uses a coupon for a 10% discount before tax. To calculate the discounted price, we take 10% of $9.99, which is $0.999 or approximately $1.00 when rounded to the nearest cent. So the discounted price before tax is $9.99 - $1.00 = $8.99.
The sales tax rate is 6.0%; to calculate the tax amount, convert the percentage to a decimal by dividing by 100, making it 0.06. Multiply the discounted price of $8.99 by 0.06 to get the tax amount, which is $0.5394 or approximately $0.54 when rounded to the nearest cent. Adding this tax to the discounted price gives us $8.99 + $0.54 = $9.53 as the total cost including the sales tax.
Lastly, Harry mails in a rebate form for $5.00. Subtracting the rebate from the total cost including tax, we get $9.53 - $5.00 = $4.53 as the final cost that Harry pays for the ream of computer paper.