At macys all sweaters are on sale for 25% off. if tony has a coupon for additional 15% off the discounted price how much will he pay for a sweater that regularly costs $35

Regular cost of a sweater = $35
Percentage of sale on sweaters 25%
Amount of discount on the sweater = (25/100) * 35
                                                    = 35/4
                                                    = 8.75
So
Discounted price of the sweater at Macys = (35 - 8.75) dollars
                                                                     = 26.25 dollars
Percentage of discount that Tony gets due to the discount coupon = 15%
So
Amount of discount that
Tony gets because of the discount coupon = (15/100) * 26.25 
                                                                      = 393.75/100
                                                                     = 3.94 dollars
So the amount that Tony pays for the sweater = (26.25 - 3.94) dollars
                                                                           = 22.31 dollars
So Tony pays $22.31 for the sweater at Macys.

The answer to that is 6