need to solve showing work

21. Estimate the sale price of the following items. Show your work. Regular Price Discount a $39.95 10% off b $9.99 - off C $1487.87 2 off d $106.67 50% off Marking Guide for Key Question 21 . Correct estimation (4 x 1 mark = 4 marks) . Logical process (4 x 2 marks = 8 marks) Total marks: 12 22. Estimate the sales tax on the purchase of a TV that costs $199.95. Marking Guide for Key Question 22 . Correct estimation (1 mark) . Logical method (2 marks) . Clear conclusion (1 mark) Total marks: 4 3. Estimate the after-tax total on the following purchase. The purchase includes a toothbrush for $2.49, a tube of toothpaste for $3.95, and floss for $1.50. Show your work and state your conclusion in a complete sentence