First find the sale price.
32 × 15% =
32 × .15 = 4.80
That's the discount. So the sale price is
32 - 4.80 = 27.20
Now add in sales tax
27.20 × 5.6% =
27.20 × .056 = 1.52
This is the sales tax. Now add it to the sale price for the final price.
27.20 + 1.52 = $28.72
