To find the number of minutes for which the costs of the two plans are equal, we can set up an equation.
Let's assume the number of minutes of calls is represented by 'm.'
For the first plan:
Cost = $9 (monthly fee) + $0.11 (per minute charge) * m
For the second plan:
Cost = $19 (monthly fee) + $0.07 (per minute charge) * m
We want to find the value of 'm' where the costs are equal. So, we set up the equation:
9 + 0.11m = 19 + 0.07m
Simplifying the equation:
0.11m - 0.07m = 19 - 9
0.04m = 10
Dividing both sides of the equation by 0.04:
m = 10 / 0.04
m = 250
Therefore, the costs of the two plans will be equal for 250 minutes of calls.
