(Answered) Determining the monthly cost of minimum

Engineering

1. A basic cellular phone plan cost $16 per month for 50 calling minutes. Additional time costs $0.25 per minute. The formula C=16+0.25(x-50) gives the monthly cost for this plan calling minutes, where x > 50. How many calling minutes are possible for a monthly cost of minimum $28 and maximum $47?

a. Minimum 98 minutes and maximum 174 minutes

b. Minimum 112 minutes and maximum 127 minutes

c. Minimum 90 minutes and maximum 140 minutes

d. Minimum 130 minutes and maximum 145 minutes

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