SOLUTION: A certain college offers students two monthly options for local telephone service. Option A: Unlimited number of local calls for $20.00 per month. Option B: Basic charge of $

Algebra ->  Coordinate Systems and Linear Equations  -> Lessons  -> Linear Equations Lesson -> SOLUTION: A certain college offers students two monthly options for local telephone service. Option A: Unlimited number of local calls for $20.00 per month. Option B: Basic charge of $      Log On


   

Question 335371: A certain college offers students two monthly options for local telephone service.
Option A: Unlimited number of local calls for $20.00 per month.
Option B: Basic charge of $15.00 per month plus $0.10 charge for each local call.
What is the least number of local calls in a month for which option A is less expensive than option B?
(A) 5 (B) 15 (C) 49 (D) 50 (E) 51
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
A%3C=B
20%3C=15%2B0.1%2AN
0.1N%3E=5
N%3E=50
When the number of calls is greater than or equal to 50, Plan B will be equal to or more expensive than Plan A.
So then N=49 is the most number of calls you can make and still be cheaper using Plan B.