How will be charged in Patrick’s Visa card ?

Question

patrick purchased four new tired regulary priced at $81.99 each, but are on sale for $40 off per a tire. if the sales tax rate is 6%, how much will be charged to patricks visa card?

Answer 1

Before tax:

 

4($81.99 - $40) = $167.96

 

After 6% tax:

 

1.06($167.96) ≅ $178.04