Answer:
I do not see a correct answer posted...see below
Explanation:
20 % OFF means you pay 80 % ( 80% is .80 in decimal)
.80 * 28 = $ 22.40 after discount (before tax)
now you need to add the 6% tax
.06 * 22.40 = 1.34 added to the 22.40 = $ 23.74 AFTER TAX