Suppose tuna is on sale for $0.90 a can, and you have a coupon for $0.40 off your total purchase. Write a function rule for the cost of n cans of tuna.

(1 point)
Responses

a. C(n) = 0.90n – 0.40

b. C(n) = 0.40n – 0.90

c. C(n) = (0.90 + n) – 0.40

d. C(n) = (0.40 + n) – 0.90