Math Problem Statement

You are choosing between two different cell phone plans. The first plan charges a rate of 25 cents per minute. The second plan charges a monthly fee of $44.95 plus 12 cents per minute. Let be the number of minutes you talk and and be the costs (in dollars) of the first and second plans. Give an equation for each in terms of t, and then find the number of talk minutes that would produce the same cost for both plans.

Solution

Let tt be the number of minutes you talk.

  • Plan 1: Charges 25 cents per minute, so the cost is directly proportional to the number of minutes. The equation for Plan 1 is:

C1(t)=0.25tC_1(t) = 0.25t

  • Plan 2: Charges a monthly fee of $44.95 plus 12 cents per minute. The equation for Plan 2 is:

C2(t)=44.95+0.12tC_2(t) = 44.95 + 0.12t

Now, to find the number of talk minutes that would produce the same cost for both plans, set the equations equal to each other:

0.25t=44.95+0.12t0.25t = 44.95 + 0.12t

Solve for tt:

  1. Subtract 0.12t0.12t from both sides:

0.25t0.12t=44.950.25t - 0.12t = 44.95

0.13t=44.950.13t = 44.95

  1. Divide both sides by 0.13:

t=44.950.13=345t = \frac{44.95}{0.13} = 345

So, the number of talk minutes that would produce the same cost for both plans is 345 minutes.

Do you want further details or have any questions about the solution?

Here are five related questions to expand your understanding:

  1. How much would you pay with each plan if you talk for 200 minutes in a month?
  2. What is the cost difference if you talk for 400 minutes under both plans?
  3. How does the cost of Plan 1 compare to Plan 2 if you only talk for 100 minutes?
  4. At what number of minutes does Plan 2 become more cost-effective than Plan 1?
  5. How would the break-even point change if the monthly fee in Plan 2 increased to $50?

Tip: For these types of problems, setting the equations equal helps find the break-even point where both options cost the same!

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Cost Comparison

Formulas

Plan 1: C1(t) = 0.25t
Plan 2: C2(t) = 44.95 + 0.12t

Theorems

Linear Equation Solving

Suitable Grade Level

Grades 8-10