Your local bakery charges $6.00 for one dozen of doughnuts. (one dozen is 12 doughnuts). if you purchase any number of doughnuts over one dozen, you will only have to pay $0.40 per doughnut. the total cost of any number of doughnuts is given by the expression below. 6+.40(d−12) which part of the expression represents the number of doughnuts purchased at the discounted rate? a. d b. (d−12) c. 6 d. 40(d−12)