A telephone company offers a monthly cellular phone plan for $19.99. It includes 250 anytime minutes plus $0.25 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. { 19.99 if 0 < x <250 C(x) = %3D 0.25x - 42.51 if x > 250 Compute the monthly cost of the cellular phone for use of the following anytime minutes. (c) 251 (a) 140 (b) 300

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