Answer:
The indifference point is 140 minutes.
Explanation:
Giving the following information:
Plan A costs $ 25 plus an additional $0.10 for each minute of calls.
Plan B costs $18 plus an additional $0.15 for each minute of calls.
First, we need to establish the total cost formula for each plan:
Plan A= 25 + 0.1*x
Plan B= 18 + 0.15*x
x= number of minutes
Now, to calculate the indifference point, we equal both formulas and isolate x:
25 + 0.1x = 18 + 0.15x
7 = 0.05x
140=x
The indifference point is 140 minutes.
Prove:
Plan A= 25 + 0.1*140= $39
Plan B= 18 + 0.15*140= $39