A telephone company offers a monthly cellular phone plan for $12.69. It includes 439 anytime minutes plus $0.78 per minute for additional minutes. The following function is used to compute the monthly cost for a subscriber, where x is the number of anytime minutes used.

Compute the monthly cost of the cellular phone use of the following anytime minutes. Round to the nearest cent as needed.

(a) 186

(b) 494

(c) 440

C(186)=