Question

A cell phone company is offering two special plans for students.

Plan A 8.95 per month flat rate and .10 per local call.
Plan B 30.00 per month including monthly fee and unlimited local calls.

Which plan is the better buy? Explain.

Answer 1

Wouldn't it be Plan B? It stays at $30 doesn't increase since it has unlimited local calls. For Plan A, sure its $8.95 but add 10 cents for every call you make adds up.

Answer 2

Yeh but still if there are 12 months you still need to multiply to see how much adds up

Answer 3

Which plan is better depends on the number of calls made per month.
Let x be the number of calls made per month.

With Plan A, the cost will be: 8.95 + 0.1x
With Plan B, the cost will be: $30.

Plan A will be better as long as: 8.95 + 0.1x < 30
Solve for x.

Answer 4

8.95 + 0.1x < 30
0.1x < 30 - 8.95
0.1x < 21.05
x < 21.05 / 0.1
x < 210.5
So if the number of calls made per month is less than or equal to 210, Plan A is better.
If more than 210 calls are made per month, Plan B is better.