Answer:
The cost of plans is same for 120 minutes.
Step-by-step explanation:
Given:
One cellular phone charge = $26.50 a month and $0.15 per minute.
Another cellular charges = $14.50 a month and $0.25 per minute.
Let the number of minutes at which both plans are same be = minutes
For minutes the plan charges are as following:
1)
2)
So, we equate the above expressions as the plans are same.
Multiplying both sides by 100.
Subtracting both sides by 1450.
Subtracting both sides by
Dividing both sides by 10.
∴
The cost of plans is same for 120 minutes.